{"gene":"CD3D","run_date":"2026-06-09T22:57:17","timeline":{"discoveries":[{"year":1991,"finding":"CD3δ and CD3γ form mutually exclusive complexes with CD3ε, producing two distinct TCR/CD3 complex forms (αβγε and αβδε) rather than a single αβγδε complex, as demonstrated by reciprocal co-immunoprecipitation and competition for CD3ε binding in transfected COS cells.","method":"Co-immunoprecipitation, COS cell transfection competition assay","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP across human and murine T cell lines plus COS cell competition assay, replicated across multiple cell systems in one study","pmids":["1826255"],"is_preprint":false},{"year":1991,"finding":"A conformational epitope on CD3ε is exposed only upon association with either CD3δ or CD3γ, and this composite epitope is the main target of widely used anti-CD3 monoclonal antibodies (OKT3, UCHT1, Leu-4, WT31), as shown by immunofluorescence and immunoprecipitation in COS cells singly or doubly transfected with CD3 subunit genes.","method":"Immunofluorescence of transfected COS cells, immunoprecipitation","journal":"Journal of immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — two orthogonal methods (IF + IP) in transfection system, replicated across multiple antibody clones","pmids":["1717585"],"is_preprint":false},{"year":1995,"finding":"TCR assembly proceeds through initial association of TCRα with CD3δε to form an αδε trimer, and TCRβ with CD3γε to form a βγε trimer; these trimers then associate and αβ disulfide bond formation occurs. The rate-limiting step in CD4+CD8+ thymocytes is the initial TCRα–CD3δε association, which protects nascent TCRα from accelerated ER degradation.","method":"Metabolic pulse-chase, immunoprecipitation in primary murine thymocytes and T cells","journal":"Immunity","confidence":"High","confidence_rationale":"Tier 2 / Strong — pulse-chase assembly kinetics with IP in primary cells, multiple assembly intermediates tracked with orthogonal pulldowns","pmids":["7719941"],"is_preprint":false},{"year":1996,"finding":"Calnexin associates exclusively with unassembled, monomeric CD3δ and TCRα glycoproteins bearing incompletely trimmed (monoglucosylated) N-glycans in the ER, prior to their incorporation into multisubunit TCR complexes; glucose trimming is required for efficient calnexin association with TCRα but not CD3δ.","method":"Metabolic labeling, co-immunoprecipitation, glycan analysis in murine splenic T cells","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — pulse-chase plus glycan-dependent Co-IP in primary splenic T cells with multiple orthogonal approaches","pmids":["8621641"],"is_preprint":false},{"year":1997,"finding":"CD3δ is required for the transition of CD4+CD8+ double-positive thymocytes to single-positive stages (positive/negative selection) but is dispensable for pre-TCR-mediated CD4−CD8− to CD4+CD8+ transition, as shown by CD3δ-knockout mice which arrest development specifically at the DP stage of αβ T cell lineage while γδ T cell development is unaffected.","method":"Gene knockout (CD3δ−/− mice), flow cytometry of thymic subpopulations","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean KO with defined developmental phenotype, replicated by multiple groups","pmids":["9135151"],"is_preprint":false},{"year":1992,"finding":"CD3δ chain is essential for surface expression of TCRαβ; loss of CD3δ mRNA results in TCR/CD3 complexes devoid of TCRαβ at the cell surface and loss of activation for cytolysis and IFN-γ production. Transfection with cytoplasmic domain-deleted CD3δ fully restores surface expression and effector functions, indicating the CD3δ cytoplasmic domain is not required for complex assembly or signal transduction.","method":"CTL clone with CD3δ mRNA loss, transfection with native or cytoplasmic-deleted CD3δ, functional assays (cytolysis, IFN-γ production)","journal":"Journal of immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — domain-deletion rescue experiment with multiple functional readouts in a defined CTL variant","pmids":["1530953"],"is_preprint":false},{"year":1992,"finding":"The majority of CD3δ chains (>90% by densitometry) are physically associated with CD4 or CD8 accessory molecules on resting, non-activated T cells, as demonstrated by co-immunoprecipitation followed by 2D gel electrophoresis and peptide mapping.","method":"Co-immunoprecipitation with anti-CD4/anti-CD8, 2D SDS-PAGE, peptide mapping of freshly isolated splenic T cells","journal":"European journal of immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal IP, 2D-PAGE, and peptide mapping with quantitative densitometry in primary cells","pmids":["1396954"],"is_preprint":false},{"year":1997,"finding":"CD3δ is physically associated with pre-TCR complexes in primary thymocytes (pTα–TCRβ–CD3γ–CD3δ–CD3ε–ζ), but CD3δ is not functionally required for the pre-TCR-mediated DN→DP transition, as CD3δ−/− mice generate normal numbers of DP thymocytes.","method":"Surface immunoprecipitation of biotinylated primary thymocytes, CD3δ−/− mouse analysis","journal":"The Journal of experimental medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — biochemical demonstration of CD3δ in pre-TCR complex plus genetic loss-of-function, two orthogonal methods","pmids":["9348303"],"is_preprint":false},{"year":2000,"finding":"CD3δ couples TCR engagement to ERK MAP kinase activation and thymocyte positive selection; CD3δ−/− thymocytes show selective deficiency in ERK activation but not other MAP kinases, correlating with impaired tyrosine phosphorylation of LAT and of CD3ζ in lipid rafts. Expression of tail-less CD3δ rescues both ERK activation and positive selection, mapping the requirement to the extracellular and/or transmembrane domains.","method":"Kinase activity assays (ERK, JNK, p38), phosphotyrosine immunoblotting of lipid raft fractions, CD3δ−/− mice with transgenic rescue","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple kinase assays plus domain-rescue transgenic mice, replicated across signaling pathways","pmids":["10935641"],"is_preprint":false},{"year":2002,"finding":"CD3δ selectively co-immunoprecipitates with CD8αβ (but not CD8αα), linking the TCR·CD3 complex to raft-associated CD8αβ; this association is absent in CD3δ-null TCR variants and promotes TCR aggregate formation and calcium mobilization upon cross-linking.","method":"Co-immunoprecipitation with anti-CD8 in T cell hybridomas and transgenic mice, calcium flux assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — selective Co-IP with CD8αβ vs. CD8αα, genetic loss-of-function validation, functional calcium readout","pmids":["12215456"],"is_preprint":false},{"year":1990,"finding":"Unassembled CD3δ subunits are degraded in or near the ER by a protease-sensitive mechanism not requiring Golgi transport, with a secondary checkpoint delivering ~25% of unassembled CD3δ to lysosomes for degradation, preventing surface expression of single subunits.","method":"Metabolic pulse-chase in transfected fibroblasts and CHO Lec1 cells, lysosomotropic agent treatment, temperature-block experiments","journal":"International immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple pharmacologic and genetic (Lec1 cells) approaches with quantitative pulse-chase in defined cell systems","pmids":["2150597"],"is_preprint":false},{"year":1994,"finding":"Raf serine/threonine kinase is associated with the TCR/CD3 complex in unstimulated murine T cells, and specifically binds to a hypophosphorylated form of CD3γ and CD3δ but not CD3ε or CD3ζ chains in COS cell expression system.","method":"Co-immunoprecipitation from murine T cells, COS cell transfection with individual CD3 chains","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — single Co-IP from primary T cells confirmed by COS cell subunit specificity mapping, single lab","pmids":["8132616"],"is_preprint":false},{"year":1997,"finding":"The CD3δ cytoplasmic domain (containing dileucine and tyrosine motifs) is required for CD3 ligand-induced TCR/CD3 down-modulation; a CTL clone expressing cytoplasmically truncated CD3δ and CD3γ is defective in ligand-induced and PMA-induced down-modulation but retains antigen-specific cytolysis and IFN-γ gene expression.","method":"CTL clone reconstitution with truncated CD3 chains, FACS analysis of TCR/CD3 surface levels, PKC inhibitor studies","journal":"Journal of immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — domain-deletion reconstitution with functional cytolysis and receptor down-modulation readouts, single lab","pmids":["9126976"],"is_preprint":false},{"year":1998,"finding":"CD3γ and CD3δ play essential, partially overlapping roles in both αβ and γδ T cell development: double-knockout (CD3γδ−/−) mice show complete arrest of thymocyte development at the DN stage and absence of both αβ and γδ T cells, whereas single knockouts each retain some T cell development.","method":"Double gene knockout mice (CD3γδ−/−), flow cytometry of thymic subpopulations","journal":"The Journal of experimental medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean double-KO mouse with defined epistatic phenotype showing overlapping function of CD3γ and CD3δ","pmids":["9763617"],"is_preprint":false},{"year":2004,"finding":"The surface TCR/CD3 complex contains exactly one molecule each of CD3δ and CD3γ, as determined by two-dimensional nonreducing/reducing gel electrophoresis of surface-biotinylated thymocytes from mice expressing tagged transgenic CD3 chains on knockout backgrounds.","method":"Surface biotinylation, 2D nonreducing/reducing SDS-PAGE of thymocytes from transgenic/knockout mice","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — quantitative stoichiometry determined by 2D-PAGE in primary cells with genetic controls","pmids":["15459203"],"is_preprint":false},{"year":2007,"finding":"Human γδ TCR incorporates CD3δ with stoichiometry TCRγδ·CD3ε₂δγζ₂, whereas mouse γδ TCR does not incorporate CD3δ and has stoichiometry TCRγδ·CD3ε₂γ₂ζ₂; this structural difference explains why CD3γ-deficient humans retain γδ T cells (CD3δ substitutes) while CD3γ-deficient mice lose γδ T cells.","method":"Blue native PAGE, anti-TCR antibodies, human CD3δ transgene rescue in CD3γδ-double-deficient mice","journal":"The Journal of experimental medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — BN-PAGE stoichiometry plus transgenic rescue, orthogonal genetic and biochemical approaches","pmids":["17923503"],"is_preprint":false},{"year":1999,"finding":"Antigen-induced TCR/CD3 down-modulation does not require CD3δ or CD3γ cytoplasmic domains (in contrast to anti-CD3 mAb-induced down-modulation which does require these domains); antigen-induced internalization of TCRβ was confirmed by confocal microscopy in CTL clones with truncated CD3δ/γ chains.","method":"CTL clones with cytoplasmic-deleted CD3δ and CD3γ, confocal microscopy, PTK inhibitor PP1, FACS","journal":"International immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — domain-deletion experiment with confocal confirmation, single lab, dissected antigen vs. antibody stimuli","pmids":["10545476"],"is_preprint":false},{"year":1998,"finding":"CD3δ proteins exist as both monomeric and disulfide-linked oligomeric species in murine T cells; in CD4+CD8+ thymocytes (unlike splenic T cells), glucose residues are not invariably removed from CD3δ before CD3ε association; calnexin associates with both monomeric and disulfide-linked CD3δ species.","method":"Metabolic labeling, non-reducing/reducing 2D-PAGE, co-immunoprecipitation in thymocytes and splenic T cells","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — 2D-PAGE and Co-IP in two primary cell types, single lab","pmids":["9603915"],"is_preprint":false},{"year":2001,"finding":"CD3δ chains associate less strongly with TCRγδ heterodimers than with TCRαβ heterodimers, with the impaired reactivity attributable specifically to weaker association with TCRγ chains rather than to differences in the intracellular environment of γδ vs. αβ T cells.","method":"Metabolic labeling, immunoprecipitation in αβ and γδ T lymphoma cell lines and TCRγδ transfectants","journal":"Scandinavian journal of immunology","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — Co-IP in multiple cell lines plus transfectants, single lab, consistent with genetic data from other groups","pmids":["11439162"],"is_preprint":false},{"year":2006,"finding":"Human CD3δ/ε heterodimer can functionally substitute for mouse CD3γ/ε in supporting pre-TCR-mediated DN→DP transition, as shown by a human CD3δε transgene rescuing the pre-TCR defect in CD3γ-deficient and CD3γδ-double-deficient mice.","method":"Human CD3δε transgene in CD3γ−/− and CD3γδ−/− mice, thymic subset analysis by flow cytometry","journal":"Molecular immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — transgenic rescue in two mouse KO backgrounds, single lab","pmids":["16412509"],"is_preprint":false},{"year":2006,"finding":"Human CD3δ can substitute for mouse CD3γ in pre-TCR-mediated DN→DP progression when expressed as a transgene in CD3γδ-double-deficient mice, but leads to attenuated TCR signaling and less efficient positive/negative selection compared to wild-type, correlating with structural instability of TCR complexes.","method":"Human CD3δ transgene in CD3δ/γ double-deficient mice, flow cytometry, TCR signaling assays","journal":"Blood","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — transgenic rescue plus signaling readouts, single lab","pmids":["16888097"],"is_preprint":false},{"year":2021,"finding":"Stable knockdown of CD3D in mature Jurkat T cells causes strong ER retention of TCR complexes, loss of ζζ dimers, and failure to reach the cell surface (<11% of controls); immature T-cell progenitors show greater plasticity, allowing some TCR surface expression that may support survival signaling.","method":"Stable shRNA knockdown in Jurkat T cells, mouse fetal thymus organ culture, flow cytometry, immunoprecipitation","journal":"Frontiers in cell and developmental biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — stable KD with defined assembly and surface expression phenotype, multiple readouts, single lab","pmids":["34249896"],"is_preprint":false},{"year":1988,"finding":"A 400 bp T cell-specific transcriptional enhancer located 0.6 kb downstream of the polyadenylation site of the CD3δ gene drives T cell-restricted expression in a position- and orientation-independent manner; the promoter itself is not T cell-restricted.","method":"DNase I hypersensitivity mapping, reporter transfection assays in T and non-T cell lines","journal":"The EMBO journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — DNase I mapping plus functional reporter assay, two methods, single lab","pmids":["2847918"],"is_preprint":false},{"year":1990,"finding":"Two cis-acting elements in the CD3δ 3' enhancer (δA and δB) mediate T cell-specific expression: δA acts as an independent enhancer bound by T cell-specific nuclear factors, while δB has no independent function but augments δA activity; protein-binding sites are conserved across other TCR/CD3 genes.","method":"Deletion analysis of enhancer fragments, reporter transfection, DNase I footprinting/gel shift","journal":"The EMBO journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — deletion/mutation reporter assays plus protein-binding studies, single lab","pmids":["2136828"],"is_preprint":false},{"year":2002,"finding":"The murine CD3δ promoter directs T cell-preferred expression via four positive regulatory elements (two initiator-like sites recruiting TFII-I, one Ets binding site, one CREB site) and one negative element using YY1; NERF-2, Elf-1, and Ets-1 contribute to lymphocyte-specific expression.","method":"Transgenic mice, deletion/substitution mutant reporter transfections, transcription factor binding studies","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — transgenic validation plus mutant scanning in vitro, multiple elements characterized, single lab","pmids":["12324448"],"is_preprint":false},{"year":2023,"finding":"A pathogenic mutation in CD3D can be corrected in patient hematopoietic stem and progenitor cells by adenine base editing (ABE), yielding 71.2% correction efficiency; edited HSPCs differentiated in artificial thymic organoids to produce mature T cells with diverse TCR repertoires and TCR-dependent effector functions.","method":"Adenine base editing of patient HSPCs, artificial thymic organoid differentiation, TCR repertoire sequencing, immunodeficient mouse transplantation","journal":"Cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — ex vivo editing with functional T cell differentiation readout, in vivo engraftment, multiple orthogonal validations","pmids":["36944331"],"is_preprint":false},{"year":2025,"finding":"TRIM13 ubiquitin ligase interacts with CD3D protein and promotes its ubiquitination; knockdown of TRIM13 increases CD3D ubiquitination and decreases CD3D levels, thereby alleviating OGD-induced cardiomyocyte apoptosis in a myocardial infarction context.","method":"Co-immunoprecipitation, ubiquitination assay, in vitro and in vivo knockdown, OGD cardiomyocyte model","journal":"iScience","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single Co-IP for interaction, ubiquitination assay in non-T cell context, functional relevance of CD3D in cardiomyocytes is atypical and not independently validated","pmids":["40746991"],"is_preprint":false}],"current_model":"CD3δ (CD3D) is an invariant transmembrane subunit that associates with CD3ε to form a CD3δε dimer incorporated into the TCR/CD3 complex (one copy per complex); it forms mutually exclusive complexes with CD3γε, is the first partner for nascent TCRα in ordered ER assembly (protected from degradation by calnexin prior to assembly), is required specifically for αβ TCR-mediated thymocyte positive selection by coupling TCR engagement to ERK/LAT/Ras signaling and raft-associated CD8αβ co-receptor function, is dispensable for pre-TCR-mediated DN→DP transition in mice, and its cytoplasmic domain controls ligand-induced (but not antigen-induced) TCR down-modulation; in humans it is incorporated into γδ TCR complexes and is indispensable for both αβ and γδ T cell development, with loss-of-function mutations causing severe combined immunodeficiency."},"narrative":{"mechanistic_narrative":"CD3δ (CD3D) is an invariant transmembrane subunit of the T-cell receptor (TCR)/CD3 complex that links antigen receptor assembly to T-cell development and signaling [PMID:7719941, PMID:9135151]. It associates with CD3ε to form a CD3δε dimer that constitutes one of two mutually exclusive complexes (the other being CD3γε), generating distinct αβδε and αβγε receptor forms rather than a single combined complex, with exactly one copy of CD3δ per surface receptor [PMID:1826255, PMID:15459203]. During ordered ER assembly, CD3δε is the first partner for nascent TCRα, forming an αδε trimer in the rate-limiting step that protects TCRα from accelerated degradation; unassembled CD3δ is recognized by calnexin via incompletely trimmed N-glycans and is otherwise degraded near the ER and in lysosomes to prevent surface display of lone subunits [PMID:7719941, PMID:8621641, PMID:2150597]. CD3δ is essential for surface expression of αβ TCR and for coupling receptor engagement to downstream signaling, and its loss arrests development specifically at the CD4+CD8+ double-positive stage of the αβ lineage while sparing pre-TCR-mediated DN→DP transition [PMID:9135151, PMID:1530953, PMID:34249896]. CD3δ couples TCR engagement to ERK MAP kinase activation and thymocyte positive selection through its extracellular/transmembrane domains, correlating with LAT and CD3ζ phosphorylation in lipid rafts and with selective association with the raft-localized CD8αβ co-receptor [PMID:10935641, PMID:12215456]. Its cytoplasmic domain is dispensable for assembly and signaling but is required for ligand-induced (not antigen-induced) TCR down-modulation [PMID:1530953, PMID:9126976, PMID:10545476]. CD3γ and CD3δ have partially overlapping roles, and a species difference in γδ TCR composition—human γδ receptors incorporate CD3δ whereas mouse γδ receptors do not—explains divergent immunodeficiency phenotypes [PMID:9763617, PMID:17923503]. Loss-of-function in CD3D causes a severe combined immunodeficiency that is correctable in patient hematopoietic stem/progenitor cells by adenine base editing, restoring mature T-cell production with diverse TCR repertoires [PMID:36944331].","teleology":[{"year":1988,"claim":"Establishing how CD3δ achieves T cell-restricted expression located the regulatory logic of the gene before its protein assembly was understood.","evidence":"DNase I hypersensitivity mapping and reporter transfection in T and non-T cell lines","pmids":["2847918"],"confidence":"Medium","gaps":["Promoter itself not T cell-restricted; element-level dissection deferred","Trans-acting factors not identified in this study"]},{"year":1990,"claim":"Dissection of the 3' enhancer (δA/δB) and identification of the ER/lysosomal degradation of unassembled CD3δ defined both transcriptional control and the quality-control fate of orphan subunits.","evidence":"Enhancer deletion/footprinting reporter assays; metabolic pulse-chase in transfected fibroblasts and Lec1 cells with lysosomotropic/temperature-block treatments","pmids":["2136828","2150597"],"confidence":"Medium","gaps":["Protease responsible for ER degradation not identified","Enhancer factors named only by binding-site conservation"]},{"year":1991,"claim":"Reciprocal co-IP showed CD3δ and CD3γ form mutually exclusive complexes with CD3ε, resolving whether the receptor contains one or two CD3 dimer types, and revealed that anti-CD3 antibody epitopes are conformational composites formed upon dimerization.","evidence":"Co-immunoprecipitation and competition assays in transfected COS cells; immunofluorescence and IP across multiple antibody clones","pmids":["1826255","1717585"],"confidence":"High","gaps":["Stoichiometry per surface complex not quantified here","Functional consequences of the two complex forms unaddressed"]},{"year":1992,"claim":"Functional reconstitution established that CD3δ is required for αβ TCR surface expression and effector function while its cytoplasmic domain is dispensable, and that most CD3δ is physically linked to CD4/CD8 co-receptors on resting cells.","evidence":"CTL clone with CD3δ mRNA loss reconstituted with native or tail-less CD3δ; co-IP with anti-CD4/CD8 plus 2D-PAGE and peptide mapping in primary T cells","pmids":["1530953","1396954"],"confidence":"High","gaps":["Domain mediating co-receptor linkage not mapped at this stage","Mechanism of CD3δ-dependent surface expression not yet biochemical"]},{"year":1994,"claim":"Identifying Raf kinase as a partner of hypophosphorylated CD3γ/CD3δ proposed a direct biochemical link between the receptor and a serine/threonine kinase cascade.","evidence":"Co-immunoprecipitation from murine T cells with COS-cell subunit specificity mapping","pmids":["8132616"],"confidence":"Medium","gaps":["Single lab, not reciprocally validated","Physiological role of the Raf–CD3δ association not established"]},{"year":1995,"claim":"Pulse-chase assembly kinetics defined the ordered ER pathway, placing TCRα–CD3δε as the rate-limiting first step that protects nascent TCRα from degradation.","evidence":"Metabolic pulse-chase and IP of assembly intermediates in primary murine thymocytes and T cells","pmids":["7719941"],"confidence":"High","gaps":["Chaperone machinery driving the step not fully defined here","Quantitative kinetics in human cells not addressed"]},{"year":1996,"claim":"Demonstrating calnexin association specifically with monomeric CD3δ and TCRα bearing monoglucosylated glycans linked glycan-dependent ER quality control to TCR subunit assembly.","evidence":"Metabolic labeling, co-IP, and glycan analysis in murine splenic T cells","pmids":["8621641"],"confidence":"High","gaps":["Glucose trimming required for calnexin binding to TCRα but not CD3δ — basis of differential dependence unresolved"]},{"year":1997,"claim":"CD3δ knockout mice and pre-TCR biochemistry separated CD3δ's roles: it is physically present in the pre-TCR but functionally required only for the αβ DP→SP transition (selection), not for DN→DP, and its cytoplasmic motifs govern ligand-induced down-modulation.","evidence":"CD3δ−/− mice with thymic flow cytometry; surface IP of biotinylated thymocytes; CTL clones with truncated CD3δ/γ and FACS","pmids":["9135151","9348303","9126976"],"confidence":"High","gaps":["Mechanism coupling CD3δ to selection not yet defined (addressed later)","Down-modulation findings single-lab/Medium confidence"]},{"year":1998,"claim":"Double-knockout epistasis and biochemical heterogeneity studies showed CD3γ and CD3δ have partially overlapping essential functions and that CD3δ exists as monomeric and oligomeric species with thymocyte-specific glycan handling.","evidence":"CD3γδ−/− double-knockout mice with thymic flow cytometry; non-reducing/reducing 2D-PAGE and co-IP in thymocytes vs. splenic T cells","pmids":["9763617","9603915"],"confidence":"High","gaps":["Molecular basis of functional redundancy not resolved","Significance of CD3δ oligomers uncharacterized"]},{"year":2000,"claim":"Mapping the selection defect to ERK activation showed CD3δ couples TCR engagement to a specific MAP kinase pathway and raft-associated phosphorylation, with the requirement residing in its extracellular/transmembrane domains.","evidence":"Kinase assays (ERK/JNK/p38), phosphotyrosine immunoblotting of lipid raft fractions, and tail-less CD3δ transgenic rescue in CD3δ−/− mice","pmids":["10935641"],"confidence":"High","gaps":["Precise structural feature transmitting the signal not identified","How ERK selectivity arises mechanistically unresolved"]},{"year":2001,"claim":"Comparing CD3δ association with αβ versus γδ TCR showed weaker incorporation into γδ complexes attributable to the TCRγ chain rather than the cellular environment.","evidence":"Metabolic labeling and IP in αβ and γδ T lymphoma lines and TCRγδ transfectants","pmids":["11439162"],"confidence":"Medium","gaps":["Single lab","Structural basis of weaker TCRγ association not defined"]},{"year":2002,"claim":"Linking CD3δ to selective CD8αβ (not CD8αα) association and characterizing the CD3δ promoter elements connected the receptor to raft-localized co-receptor function and detailed its transcriptional control.","evidence":"Anti-CD8 co-IP and calcium flux in hybridomas/transgenic mice; transgenic mice and mutant reporter scanning for promoter elements","pmids":["12215456","12324448"],"confidence":"Medium","gaps":["Direct contact interface between CD3δ and CD8αβ not mapped","Promoter element functions characterized largely in single lab"]},{"year":2004,"claim":"Quantitative 2D-PAGE established that the surface receptor contains exactly one CD3δ and one CD3γ, fixing the stoichiometry of the complex.","evidence":"Surface biotinylation and 2D nonreducing/reducing SDS-PAGE of thymocytes from tagged transgenic/knockout mice","pmids":["15459203"],"confidence":"High","gaps":["Stoichiometry of cytoplasmic/intracellular assembly intermediates not addressed"]},{"year":2006,"claim":"Cross-species transgenic rescue showed human CD3δε can substitute for mouse CD3γ in pre-TCR signaling and DN→DP progression, but with attenuated downstream signaling and selection.","evidence":"Human CD3δε / CD3δ transgenes in CD3γ−/− and CD3γδ−/− mice with thymic flow cytometry and signaling assays","pmids":["16412509","16888097"],"confidence":"Medium","gaps":["Single-lab rescue experiments","Structural instability inferred, not directly visualized"]},{"year":2007,"claim":"Defining the species difference in γδ TCR composition (human γδ incorporates CD3δ, mouse does not) explained why CD3γ deficiency spares γδ T cells in humans but not mice.","evidence":"Blue native PAGE stoichiometry and human CD3δ transgene rescue in CD3γδ-double-deficient mice","pmids":["17923503"],"confidence":"High","gaps":["Structural basis of differential CD3δ incorporation in γδ receptors not resolved"]},{"year":2021,"claim":"Stable CD3D knockdown in human Jurkat cells confirmed its requirement for TCR ER export and ζζ dimer formation, while showing immature progenitors tolerate loss with residual surface expression.","evidence":"Stable shRNA knockdown in Jurkat cells and mouse fetal thymus organ culture with flow cytometry and IP","pmids":["34249896"],"confidence":"Medium","gaps":["Single lab","Survival-signaling role of residual receptor in progenitors not directly demonstrated"]},{"year":2023,"claim":"Adenine base editing of patient HSPCs corrected a pathogenic CD3D mutation and restored functional T-cell production, providing direct evidence that CD3D loss-of-function causes a correctable T-cell immunodeficiency.","evidence":"ABE of patient HSPCs, artificial thymic organoid differentiation, TCR repertoire sequencing, and immunodeficient mouse engraftment","pmids":["36944331"],"confidence":"High","gaps":["Long-term durability and off-target profile not detailed here"]},{"year":2025,"claim":"A report of TRIM13-mediated CD3D ubiquitination in cardiomyocytes proposes a degradation partner outside the canonical T-cell context.","evidence":"Co-IP and ubiquitination assay with TRIM13 knockdown in an OGD cardiomyocyte/myocardial infarction model","pmids":["40746991"],"confidence":"Low","gaps":["Single Co-IP without reciprocal validation","CD3D role in cardiomyocytes is atypical and not independently confirmed","Relevance to T-cell biology unclear"]},{"year":null,"claim":"How CD3δ's extracellular/transmembrane domains structurally transmit the ERK-selective signal that drives positive selection, and the precise molecular interface with CD8αβ, remain undefined.","evidence":"","pmids":[],"confidence":"High","gaps":["No atomic-resolution structure of the signaling-competent CD3δ interface in the corpus","Mechanism of ERK pathway selectivity unresolved","CD3δ–CD8αβ contact residues unmapped"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060089","term_label":"molecular transducer activity","supporting_discovery_ids":[8,5]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[2,9]},{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[0,14]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[5,9,14]},{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[3,10,2]}],"pathway":[{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[4,8,13]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[4,13]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[8,9]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[2,3,10]}],"complexes":["TCR/CD3 complex","pre-TCR complex","CD3δε dimer"],"partners":["CD3E","TRA (TCRΑ)","CANX (CALNEXIN)","CD8A","CD8B","RAF1","TRIM13"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P04234","full_name":"T-cell surface glycoprotein CD3 delta chain","aliases":["T-cell receptor T3 delta chain"],"length_aa":171,"mass_kda":18.9,"function":"Part of the TCR-CD3 complex present on T-lymphocyte cell surface that plays an essential role in adaptive immune response. When antigen presenting cells (APCs) activate T-cell receptor (TCR), TCR-mediated signals are transmitted across the cell membrane by the CD3 chains CD3D, CD3E, CD3G and CD247/CD3Z. All CD3 chains contain immunoreceptor tyrosine-based activation motifs (ITAMs) in their cytoplasmic domain. Upon TCR engagement, these motifs become phosphorylated by Src family protein tyrosine kinases LCK and FYN, resulting in the activation of downstream signaling pathways (PubMed:2470098). In addition of this role of signal transduction in T-cell activation, CD3D plays an essential role in thymocyte differentiation. Indeed, participates in correct intracellular TCR-CD3 complex assembly and surface expression. In absence of a functional TCR-CD3 complex, thymocytes are unable to differentiate properly. 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immunology","url":"https://pubmed.ncbi.nlm.nih.gov/10383932","citation_count":5,"is_preprint":false},{"pmid":"39530557","id":"PMC_39530557","title":"CD3D silencing alleviates diabetic nephropathy via inhibition of JAK/STAT pathway.","date":"2024","source":"FASEB journal : official publication of the Federation of American Societies for Experimental Biology","url":"https://pubmed.ncbi.nlm.nih.gov/39530557","citation_count":4,"is_preprint":false},{"pmid":"40746991","id":"PMC_40746991","title":"TRIM13 prevents cardiomyocyte injury by affecting apoptosis through interacting with CD3D in myocardial infarction.","date":"2025","source":"iScience","url":"https://pubmed.ncbi.nlm.nih.gov/40746991","citation_count":0,"is_preprint":false},{"pmid":"41198548","id":"PMC_41198548","title":"Calcitonin Alleviates Sepsis-Induced Acute Lung Injury by Inhibiting the HMGB1/MyD88/NF-κB Pathway by Targeting CD3D.","date":"2025","source":"Frontiers in bioscience (Landmark edition)","url":"https://pubmed.ncbi.nlm.nih.gov/41198548","citation_count":0,"is_preprint":false},{"pmid":"27053617","id":"PMC_27053617","title":"[Changes of CD3γ, CD3δ and CD3epsilon chains mRNAs in lead-poisoned patients after chelate treatment].","date":"2016","source":"Xi bao yu fen zi mian yi xue za zhi = Chinese journal of cellular and molecular immunology","url":"https://pubmed.ncbi.nlm.nih.gov/27053617","citation_count":0,"is_preprint":false},{"pmid":"42065189","id":"PMC_42065189","title":"Exploration of CD2 and CD3D as potential immune-related biomarkers for IORT in breast cancer treatment.","date":"2026","source":"Medicine","url":"https://pubmed.ncbi.nlm.nih.gov/42065189","citation_count":0,"is_preprint":false},{"pmid":"40471880","id":"PMC_40471880","title":"Variants in Lrrk2 and Snca deficiency do not alter the course of primary encephalitis due to neurotropic reovirus T3D in newborn mice.","date":"2025","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/40471880","citation_count":0,"is_preprint":false},{"pmid":null,"id":"bio_10.1101_2024.09.28.615578","title":"Variants in  <i>Lrrk2</i>  and  <i>Snca</i>  deficiency do not alter the course of primary encephalitis due to neurotropic reovirus T3D in newborn mice","date":"2024-09-28","source":"bioRxiv","url":"https://doi.org/10.1101/2024.09.28.615578","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":36516,"output_tokens":6284,"usd":0.101904,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":16026,"output_tokens":5600,"usd":0.110065,"stage2_stop_reason":"end_turn"},"total_usd":0.211969,"stage1_batch_id":"msgbatch_01ACAxJQabDsht39JXeWG22d","stage2_batch_id":"msgbatch_01QEU22A9U5sbPTgsMzTmvSf","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1991,\n      \"finding\": \"CD3δ and CD3γ form mutually exclusive complexes with CD3ε, producing two distinct TCR/CD3 complex forms (αβγε and αβδε) rather than a single αβγδε complex, as demonstrated by reciprocal co-immunoprecipitation and competition for CD3ε binding in transfected COS cells.\",\n      \"method\": \"Co-immunoprecipitation, COS cell transfection competition assay\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP across human and murine T cell lines plus COS cell competition assay, replicated across multiple cell systems in one study\",\n      \"pmids\": [\"1826255\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1991,\n      \"finding\": \"A conformational epitope on CD3ε is exposed only upon association with either CD3δ or CD3γ, and this composite epitope is the main target of widely used anti-CD3 monoclonal antibodies (OKT3, UCHT1, Leu-4, WT31), as shown by immunofluorescence and immunoprecipitation in COS cells singly or doubly transfected with CD3 subunit genes.\",\n      \"method\": \"Immunofluorescence of transfected COS cells, immunoprecipitation\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — two orthogonal methods (IF + IP) in transfection system, replicated across multiple antibody clones\",\n      \"pmids\": [\"1717585\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"TCR assembly proceeds through initial association of TCRα with CD3δε to form an αδε trimer, and TCRβ with CD3γε to form a βγε trimer; these trimers then associate and αβ disulfide bond formation occurs. The rate-limiting step in CD4+CD8+ thymocytes is the initial TCRα–CD3δε association, which protects nascent TCRα from accelerated ER degradation.\",\n      \"method\": \"Metabolic pulse-chase, immunoprecipitation in primary murine thymocytes and T cells\",\n      \"journal\": \"Immunity\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — pulse-chase assembly kinetics with IP in primary cells, multiple assembly intermediates tracked with orthogonal pulldowns\",\n      \"pmids\": [\"7719941\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"Calnexin associates exclusively with unassembled, monomeric CD3δ and TCRα glycoproteins bearing incompletely trimmed (monoglucosylated) N-glycans in the ER, prior to their incorporation into multisubunit TCR complexes; glucose trimming is required for efficient calnexin association with TCRα but not CD3δ.\",\n      \"method\": \"Metabolic labeling, co-immunoprecipitation, glycan analysis in murine splenic T cells\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — pulse-chase plus glycan-dependent Co-IP in primary splenic T cells with multiple orthogonal approaches\",\n      \"pmids\": [\"8621641\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"CD3δ is required for the transition of CD4+CD8+ double-positive thymocytes to single-positive stages (positive/negative selection) but is dispensable for pre-TCR-mediated CD4−CD8− to CD4+CD8+ transition, as shown by CD3δ-knockout mice which arrest development specifically at the DP stage of αβ T cell lineage while γδ T cell development is unaffected.\",\n      \"method\": \"Gene knockout (CD3δ−/− mice), flow cytometry of thymic subpopulations\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean KO with defined developmental phenotype, replicated by multiple groups\",\n      \"pmids\": [\"9135151\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1992,\n      \"finding\": \"CD3δ chain is essential for surface expression of TCRαβ; loss of CD3δ mRNA results in TCR/CD3 complexes devoid of TCRαβ at the cell surface and loss of activation for cytolysis and IFN-γ production. Transfection with cytoplasmic domain-deleted CD3δ fully restores surface expression and effector functions, indicating the CD3δ cytoplasmic domain is not required for complex assembly or signal transduction.\",\n      \"method\": \"CTL clone with CD3δ mRNA loss, transfection with native or cytoplasmic-deleted CD3δ, functional assays (cytolysis, IFN-γ production)\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — domain-deletion rescue experiment with multiple functional readouts in a defined CTL variant\",\n      \"pmids\": [\"1530953\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1992,\n      \"finding\": \"The majority of CD3δ chains (>90% by densitometry) are physically associated with CD4 or CD8 accessory molecules on resting, non-activated T cells, as demonstrated by co-immunoprecipitation followed by 2D gel electrophoresis and peptide mapping.\",\n      \"method\": \"Co-immunoprecipitation with anti-CD4/anti-CD8, 2D SDS-PAGE, peptide mapping of freshly isolated splenic T cells\",\n      \"journal\": \"European journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal IP, 2D-PAGE, and peptide mapping with quantitative densitometry in primary cells\",\n      \"pmids\": [\"1396954\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"CD3δ is physically associated with pre-TCR complexes in primary thymocytes (pTα–TCRβ–CD3γ–CD3δ–CD3ε–ζ), but CD3δ is not functionally required for the pre-TCR-mediated DN→DP transition, as CD3δ−/− mice generate normal numbers of DP thymocytes.\",\n      \"method\": \"Surface immunoprecipitation of biotinylated primary thymocytes, CD3δ−/− mouse analysis\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — biochemical demonstration of CD3δ in pre-TCR complex plus genetic loss-of-function, two orthogonal methods\",\n      \"pmids\": [\"9348303\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"CD3δ couples TCR engagement to ERK MAP kinase activation and thymocyte positive selection; CD3δ−/− thymocytes show selective deficiency in ERK activation but not other MAP kinases, correlating with impaired tyrosine phosphorylation of LAT and of CD3ζ in lipid rafts. Expression of tail-less CD3δ rescues both ERK activation and positive selection, mapping the requirement to the extracellular and/or transmembrane domains.\",\n      \"method\": \"Kinase activity assays (ERK, JNK, p38), phosphotyrosine immunoblotting of lipid raft fractions, CD3δ−/− mice with transgenic rescue\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple kinase assays plus domain-rescue transgenic mice, replicated across signaling pathways\",\n      \"pmids\": [\"10935641\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"CD3δ selectively co-immunoprecipitates with CD8αβ (but not CD8αα), linking the TCR·CD3 complex to raft-associated CD8αβ; this association is absent in CD3δ-null TCR variants and promotes TCR aggregate formation and calcium mobilization upon cross-linking.\",\n      \"method\": \"Co-immunoprecipitation with anti-CD8 in T cell hybridomas and transgenic mice, calcium flux assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — selective Co-IP with CD8αβ vs. CD8αα, genetic loss-of-function validation, functional calcium readout\",\n      \"pmids\": [\"12215456\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1990,\n      \"finding\": \"Unassembled CD3δ subunits are degraded in or near the ER by a protease-sensitive mechanism not requiring Golgi transport, with a secondary checkpoint delivering ~25% of unassembled CD3δ to lysosomes for degradation, preventing surface expression of single subunits.\",\n      \"method\": \"Metabolic pulse-chase in transfected fibroblasts and CHO Lec1 cells, lysosomotropic agent treatment, temperature-block experiments\",\n      \"journal\": \"International immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple pharmacologic and genetic (Lec1 cells) approaches with quantitative pulse-chase in defined cell systems\",\n      \"pmids\": [\"2150597\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1994,\n      \"finding\": \"Raf serine/threonine kinase is associated with the TCR/CD3 complex in unstimulated murine T cells, and specifically binds to a hypophosphorylated form of CD3γ and CD3δ but not CD3ε or CD3ζ chains in COS cell expression system.\",\n      \"method\": \"Co-immunoprecipitation from murine T cells, COS cell transfection with individual CD3 chains\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — single Co-IP from primary T cells confirmed by COS cell subunit specificity mapping, single lab\",\n      \"pmids\": [\"8132616\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"The CD3δ cytoplasmic domain (containing dileucine and tyrosine motifs) is required for CD3 ligand-induced TCR/CD3 down-modulation; a CTL clone expressing cytoplasmically truncated CD3δ and CD3γ is defective in ligand-induced and PMA-induced down-modulation but retains antigen-specific cytolysis and IFN-γ gene expression.\",\n      \"method\": \"CTL clone reconstitution with truncated CD3 chains, FACS analysis of TCR/CD3 surface levels, PKC inhibitor studies\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — domain-deletion reconstitution with functional cytolysis and receptor down-modulation readouts, single lab\",\n      \"pmids\": [\"9126976\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"CD3γ and CD3δ play essential, partially overlapping roles in both αβ and γδ T cell development: double-knockout (CD3γδ−/−) mice show complete arrest of thymocyte development at the DN stage and absence of both αβ and γδ T cells, whereas single knockouts each retain some T cell development.\",\n      \"method\": \"Double gene knockout mice (CD3γδ−/−), flow cytometry of thymic subpopulations\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean double-KO mouse with defined epistatic phenotype showing overlapping function of CD3γ and CD3δ\",\n      \"pmids\": [\"9763617\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"The surface TCR/CD3 complex contains exactly one molecule each of CD3δ and CD3γ, as determined by two-dimensional nonreducing/reducing gel electrophoresis of surface-biotinylated thymocytes from mice expressing tagged transgenic CD3 chains on knockout backgrounds.\",\n      \"method\": \"Surface biotinylation, 2D nonreducing/reducing SDS-PAGE of thymocytes from transgenic/knockout mice\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — quantitative stoichiometry determined by 2D-PAGE in primary cells with genetic controls\",\n      \"pmids\": [\"15459203\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Human γδ TCR incorporates CD3δ with stoichiometry TCRγδ·CD3ε₂δγζ₂, whereas mouse γδ TCR does not incorporate CD3δ and has stoichiometry TCRγδ·CD3ε₂γ₂ζ₂; this structural difference explains why CD3γ-deficient humans retain γδ T cells (CD3δ substitutes) while CD3γ-deficient mice lose γδ T cells.\",\n      \"method\": \"Blue native PAGE, anti-TCR antibodies, human CD3δ transgene rescue in CD3γδ-double-deficient mice\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — BN-PAGE stoichiometry plus transgenic rescue, orthogonal genetic and biochemical approaches\",\n      \"pmids\": [\"17923503\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Antigen-induced TCR/CD3 down-modulation does not require CD3δ or CD3γ cytoplasmic domains (in contrast to anti-CD3 mAb-induced down-modulation which does require these domains); antigen-induced internalization of TCRβ was confirmed by confocal microscopy in CTL clones with truncated CD3δ/γ chains.\",\n      \"method\": \"CTL clones with cytoplasmic-deleted CD3δ and CD3γ, confocal microscopy, PTK inhibitor PP1, FACS\",\n      \"journal\": \"International immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — domain-deletion experiment with confocal confirmation, single lab, dissected antigen vs. antibody stimuli\",\n      \"pmids\": [\"10545476\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"CD3δ proteins exist as both monomeric and disulfide-linked oligomeric species in murine T cells; in CD4+CD8+ thymocytes (unlike splenic T cells), glucose residues are not invariably removed from CD3δ before CD3ε association; calnexin associates with both monomeric and disulfide-linked CD3δ species.\",\n      \"method\": \"Metabolic labeling, non-reducing/reducing 2D-PAGE, co-immunoprecipitation in thymocytes and splenic T cells\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — 2D-PAGE and Co-IP in two primary cell types, single lab\",\n      \"pmids\": [\"9603915\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"CD3δ chains associate less strongly with TCRγδ heterodimers than with TCRαβ heterodimers, with the impaired reactivity attributable specifically to weaker association with TCRγ chains rather than to differences in the intracellular environment of γδ vs. αβ T cells.\",\n      \"method\": \"Metabolic labeling, immunoprecipitation in αβ and γδ T lymphoma cell lines and TCRγδ transfectants\",\n      \"journal\": \"Scandinavian journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — Co-IP in multiple cell lines plus transfectants, single lab, consistent with genetic data from other groups\",\n      \"pmids\": [\"11439162\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Human CD3δ/ε heterodimer can functionally substitute for mouse CD3γ/ε in supporting pre-TCR-mediated DN→DP transition, as shown by a human CD3δε transgene rescuing the pre-TCR defect in CD3γ-deficient and CD3γδ-double-deficient mice.\",\n      \"method\": \"Human CD3δε transgene in CD3γ−/− and CD3γδ−/− mice, thymic subset analysis by flow cytometry\",\n      \"journal\": \"Molecular immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — transgenic rescue in two mouse KO backgrounds, single lab\",\n      \"pmids\": [\"16412509\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Human CD3δ can substitute for mouse CD3γ in pre-TCR-mediated DN→DP progression when expressed as a transgene in CD3γδ-double-deficient mice, but leads to attenuated TCR signaling and less efficient positive/negative selection compared to wild-type, correlating with structural instability of TCR complexes.\",\n      \"method\": \"Human CD3δ transgene in CD3δ/γ double-deficient mice, flow cytometry, TCR signaling assays\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — transgenic rescue plus signaling readouts, single lab\",\n      \"pmids\": [\"16888097\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Stable knockdown of CD3D in mature Jurkat T cells causes strong ER retention of TCR complexes, loss of ζζ dimers, and failure to reach the cell surface (<11% of controls); immature T-cell progenitors show greater plasticity, allowing some TCR surface expression that may support survival signaling.\",\n      \"method\": \"Stable shRNA knockdown in Jurkat T cells, mouse fetal thymus organ culture, flow cytometry, immunoprecipitation\",\n      \"journal\": \"Frontiers in cell and developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — stable KD with defined assembly and surface expression phenotype, multiple readouts, single lab\",\n      \"pmids\": [\"34249896\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1988,\n      \"finding\": \"A 400 bp T cell-specific transcriptional enhancer located 0.6 kb downstream of the polyadenylation site of the CD3δ gene drives T cell-restricted expression in a position- and orientation-independent manner; the promoter itself is not T cell-restricted.\",\n      \"method\": \"DNase I hypersensitivity mapping, reporter transfection assays in T and non-T cell lines\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — DNase I mapping plus functional reporter assay, two methods, single lab\",\n      \"pmids\": [\"2847918\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1990,\n      \"finding\": \"Two cis-acting elements in the CD3δ 3' enhancer (δA and δB) mediate T cell-specific expression: δA acts as an independent enhancer bound by T cell-specific nuclear factors, while δB has no independent function but augments δA activity; protein-binding sites are conserved across other TCR/CD3 genes.\",\n      \"method\": \"Deletion analysis of enhancer fragments, reporter transfection, DNase I footprinting/gel shift\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — deletion/mutation reporter assays plus protein-binding studies, single lab\",\n      \"pmids\": [\"2136828\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"The murine CD3δ promoter directs T cell-preferred expression via four positive regulatory elements (two initiator-like sites recruiting TFII-I, one Ets binding site, one CREB site) and one negative element using YY1; NERF-2, Elf-1, and Ets-1 contribute to lymphocyte-specific expression.\",\n      \"method\": \"Transgenic mice, deletion/substitution mutant reporter transfections, transcription factor binding studies\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — transgenic validation plus mutant scanning in vitro, multiple elements characterized, single lab\",\n      \"pmids\": [\"12324448\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"A pathogenic mutation in CD3D can be corrected in patient hematopoietic stem and progenitor cells by adenine base editing (ABE), yielding 71.2% correction efficiency; edited HSPCs differentiated in artificial thymic organoids to produce mature T cells with diverse TCR repertoires and TCR-dependent effector functions.\",\n      \"method\": \"Adenine base editing of patient HSPCs, artificial thymic organoid differentiation, TCR repertoire sequencing, immunodeficient mouse transplantation\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — ex vivo editing with functional T cell differentiation readout, in vivo engraftment, multiple orthogonal validations\",\n      \"pmids\": [\"36944331\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"TRIM13 ubiquitin ligase interacts with CD3D protein and promotes its ubiquitination; knockdown of TRIM13 increases CD3D ubiquitination and decreases CD3D levels, thereby alleviating OGD-induced cardiomyocyte apoptosis in a myocardial infarction context.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, in vitro and in vivo knockdown, OGD cardiomyocyte model\",\n      \"journal\": \"iScience\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single Co-IP for interaction, ubiquitination assay in non-T cell context, functional relevance of CD3D in cardiomyocytes is atypical and not independently validated\",\n      \"pmids\": [\"40746991\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CD3δ (CD3D) is an invariant transmembrane subunit that associates with CD3ε to form a CD3δε dimer incorporated into the TCR/CD3 complex (one copy per complex); it forms mutually exclusive complexes with CD3γε, is the first partner for nascent TCRα in ordered ER assembly (protected from degradation by calnexin prior to assembly), is required specifically for αβ TCR-mediated thymocyte positive selection by coupling TCR engagement to ERK/LAT/Ras signaling and raft-associated CD8αβ co-receptor function, is dispensable for pre-TCR-mediated DN→DP transition in mice, and its cytoplasmic domain controls ligand-induced (but not antigen-induced) TCR down-modulation; in humans it is incorporated into γδ TCR complexes and is indispensable for both αβ and γδ T cell development, with loss-of-function mutations causing severe combined immunodeficiency.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"CD3δ (CD3D) is an invariant transmembrane subunit of the T-cell receptor (TCR)/CD3 complex that links antigen receptor assembly to T-cell development and signaling [#2, #4]. It associates with CD3ε to form a CD3δε dimer that constitutes one of two mutually exclusive complexes (the other being CD3γε), generating distinct αβδε and αβγε receptor forms rather than a single combined complex, with exactly one copy of CD3δ per surface receptor [#0, #14]. During ordered ER assembly, CD3δε is the first partner for nascent TCRα, forming an αδε trimer in the rate-limiting step that protects TCRα from accelerated degradation; unassembled CD3δ is recognized by calnexin via incompletely trimmed N-glycans and is otherwise degraded near the ER and in lysosomes to prevent surface display of lone subunits [#2, #3, #10]. CD3δ is essential for surface expression of αβ TCR and for coupling receptor engagement to downstream signaling, and its loss arrests development specifically at the CD4+CD8+ double-positive stage of the αβ lineage while sparing pre-TCR-mediated DN→DP transition [#4, #5, #21]. CD3δ couples TCR engagement to ERK MAP kinase activation and thymocyte positive selection through its extracellular/transmembrane domains, correlating with LAT and CD3ζ phosphorylation in lipid rafts and with selective association with the raft-localized CD8αβ co-receptor [#8, #9]. Its cytoplasmic domain is dispensable for assembly and signaling but is required for ligand-induced (not antigen-induced) TCR down-modulation [#5, #12, #16]. CD3γ and CD3δ have partially overlapping roles, and a species difference in γδ TCR composition—human γδ receptors incorporate CD3δ whereas mouse γδ receptors do not—explains divergent immunodeficiency phenotypes [#13, #15]. Loss-of-function in CD3D causes a severe combined immunodeficiency that is correctable in patient hematopoietic stem/progenitor cells by adenine base editing, restoring mature T-cell production with diverse TCR repertoires [#25].\",\n  \"teleology\": [\n    {\n      \"year\": 1988,\n      \"claim\": \"Establishing how CD3δ achieves T cell-restricted expression located the regulatory logic of the gene before its protein assembly was understood.\",\n      \"evidence\": \"DNase I hypersensitivity mapping and reporter transfection in T and non-T cell lines\",\n      \"pmids\": [\"2847918\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Promoter itself not T cell-restricted; element-level dissection deferred\", \"Trans-acting factors not identified in this study\"]\n    },\n    {\n      \"year\": 1990,\n      \"claim\": \"Dissection of the 3' enhancer (δA/δB) and identification of the ER/lysosomal degradation of unassembled CD3δ defined both transcriptional control and the quality-control fate of orphan subunits.\",\n      \"evidence\": \"Enhancer deletion/footprinting reporter assays; metabolic pulse-chase in transfected fibroblasts and Lec1 cells with lysosomotropic/temperature-block treatments\",\n      \"pmids\": [\"2136828\", \"2150597\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Protease responsible for ER degradation not identified\", \"Enhancer factors named only by binding-site conservation\"]\n    },\n    {\n      \"year\": 1991,\n      \"claim\": \"Reciprocal co-IP showed CD3δ and CD3γ form mutually exclusive complexes with CD3ε, resolving whether the receptor contains one or two CD3 dimer types, and revealed that anti-CD3 antibody epitopes are conformational composites formed upon dimerization.\",\n      \"evidence\": \"Co-immunoprecipitation and competition assays in transfected COS cells; immunofluorescence and IP across multiple antibody clones\",\n      \"pmids\": [\"1826255\", \"1717585\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry per surface complex not quantified here\", \"Functional consequences of the two complex forms unaddressed\"]\n    },\n    {\n      \"year\": 1992,\n      \"claim\": \"Functional reconstitution established that CD3δ is required for αβ TCR surface expression and effector function while its cytoplasmic domain is dispensable, and that most CD3δ is physically linked to CD4/CD8 co-receptors on resting cells.\",\n      \"evidence\": \"CTL clone with CD3δ mRNA loss reconstituted with native or tail-less CD3δ; co-IP with anti-CD4/CD8 plus 2D-PAGE and peptide mapping in primary T cells\",\n      \"pmids\": [\"1530953\", \"1396954\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Domain mediating co-receptor linkage not mapped at this stage\", \"Mechanism of CD3δ-dependent surface expression not yet biochemical\"]\n    },\n    {\n      \"year\": 1994,\n      \"claim\": \"Identifying Raf kinase as a partner of hypophosphorylated CD3γ/CD3δ proposed a direct biochemical link between the receptor and a serine/threonine kinase cascade.\",\n      \"evidence\": \"Co-immunoprecipitation from murine T cells with COS-cell subunit specificity mapping\",\n      \"pmids\": [\"8132616\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab, not reciprocally validated\", \"Physiological role of the Raf–CD3δ association not established\"]\n    },\n    {\n      \"year\": 1995,\n      \"claim\": \"Pulse-chase assembly kinetics defined the ordered ER pathway, placing TCRα–CD3δε as the rate-limiting first step that protects nascent TCRα from degradation.\",\n      \"evidence\": \"Metabolic pulse-chase and IP of assembly intermediates in primary murine thymocytes and T cells\",\n      \"pmids\": [\"7719941\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Chaperone machinery driving the step not fully defined here\", \"Quantitative kinetics in human cells not addressed\"]\n    },\n    {\n      \"year\": 1996,\n      \"claim\": \"Demonstrating calnexin association specifically with monomeric CD3δ and TCRα bearing monoglucosylated glycans linked glycan-dependent ER quality control to TCR subunit assembly.\",\n      \"evidence\": \"Metabolic labeling, co-IP, and glycan analysis in murine splenic T cells\",\n      \"pmids\": [\"8621641\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Glucose trimming required for calnexin binding to TCRα but not CD3δ — basis of differential dependence unresolved\"]\n    },\n    {\n      \"year\": 1997,\n      \"claim\": \"CD3δ knockout mice and pre-TCR biochemistry separated CD3δ's roles: it is physically present in the pre-TCR but functionally required only for the αβ DP→SP transition (selection), not for DN→DP, and its cytoplasmic motifs govern ligand-induced down-modulation.\",\n      \"evidence\": \"CD3δ−/− mice with thymic flow cytometry; surface IP of biotinylated thymocytes; CTL clones with truncated CD3δ/γ and FACS\",\n      \"pmids\": [\"9135151\", \"9348303\", \"9126976\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism coupling CD3δ to selection not yet defined (addressed later)\", \"Down-modulation findings single-lab/Medium confidence\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Double-knockout epistasis and biochemical heterogeneity studies showed CD3γ and CD3δ have partially overlapping essential functions and that CD3δ exists as monomeric and oligomeric species with thymocyte-specific glycan handling.\",\n      \"evidence\": \"CD3γδ−/− double-knockout mice with thymic flow cytometry; non-reducing/reducing 2D-PAGE and co-IP in thymocytes vs. splenic T cells\",\n      \"pmids\": [\"9763617\", \"9603915\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis of functional redundancy not resolved\", \"Significance of CD3δ oligomers uncharacterized\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Mapping the selection defect to ERK activation showed CD3δ couples TCR engagement to a specific MAP kinase pathway and raft-associated phosphorylation, with the requirement residing in its extracellular/transmembrane domains.\",\n      \"evidence\": \"Kinase assays (ERK/JNK/p38), phosphotyrosine immunoblotting of lipid raft fractions, and tail-less CD3δ transgenic rescue in CD3δ−/− mice\",\n      \"pmids\": [\"10935641\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Precise structural feature transmitting the signal not identified\", \"How ERK selectivity arises mechanistically unresolved\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Comparing CD3δ association with αβ versus γδ TCR showed weaker incorporation into γδ complexes attributable to the TCRγ chain rather than the cellular environment.\",\n      \"evidence\": \"Metabolic labeling and IP in αβ and γδ T lymphoma lines and TCRγδ transfectants\",\n      \"pmids\": [\"11439162\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"Structural basis of weaker TCRγ association not defined\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Linking CD3δ to selective CD8αβ (not CD8αα) association and characterizing the CD3δ promoter elements connected the receptor to raft-localized co-receptor function and detailed its transcriptional control.\",\n      \"evidence\": \"Anti-CD8 co-IP and calcium flux in hybridomas/transgenic mice; transgenic mice and mutant reporter scanning for promoter elements\",\n      \"pmids\": [\"12215456\", \"12324448\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct contact interface between CD3δ and CD8αβ not mapped\", \"Promoter element functions characterized largely in single lab\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Quantitative 2D-PAGE established that the surface receptor contains exactly one CD3δ and one CD3γ, fixing the stoichiometry of the complex.\",\n      \"evidence\": \"Surface biotinylation and 2D nonreducing/reducing SDS-PAGE of thymocytes from tagged transgenic/knockout mice\",\n      \"pmids\": [\"15459203\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry of cytoplasmic/intracellular assembly intermediates not addressed\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Cross-species transgenic rescue showed human CD3δε can substitute for mouse CD3γ in pre-TCR signaling and DN→DP progression, but with attenuated downstream signaling and selection.\",\n      \"evidence\": \"Human CD3δε / CD3δ transgenes in CD3γ−/− and CD3γδ−/− mice with thymic flow cytometry and signaling assays\",\n      \"pmids\": [\"16412509\", \"16888097\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab rescue experiments\", \"Structural instability inferred, not directly visualized\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Defining the species difference in γδ TCR composition (human γδ incorporates CD3δ, mouse does not) explained why CD3γ deficiency spares γδ T cells in humans but not mice.\",\n      \"evidence\": \"Blue native PAGE stoichiometry and human CD3δ transgene rescue in CD3γδ-double-deficient mice\",\n      \"pmids\": [\"17923503\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of differential CD3δ incorporation in γδ receptors not resolved\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Stable CD3D knockdown in human Jurkat cells confirmed its requirement for TCR ER export and ζζ dimer formation, while showing immature progenitors tolerate loss with residual surface expression.\",\n      \"evidence\": \"Stable shRNA knockdown in Jurkat cells and mouse fetal thymus organ culture with flow cytometry and IP\",\n      \"pmids\": [\"34249896\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"Survival-signaling role of residual receptor in progenitors not directly demonstrated\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Adenine base editing of patient HSPCs corrected a pathogenic CD3D mutation and restored functional T-cell production, providing direct evidence that CD3D loss-of-function causes a correctable T-cell immunodeficiency.\",\n      \"evidence\": \"ABE of patient HSPCs, artificial thymic organoid differentiation, TCR repertoire sequencing, and immunodeficient mouse engraftment\",\n      \"pmids\": [\"36944331\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Long-term durability and off-target profile not detailed here\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"A report of TRIM13-mediated CD3D ubiquitination in cardiomyocytes proposes a degradation partner outside the canonical T-cell context.\",\n      \"evidence\": \"Co-IP and ubiquitination assay with TRIM13 knockdown in an OGD cardiomyocyte/myocardial infarction model\",\n      \"pmids\": [\"40746991\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Single Co-IP without reciprocal validation\", \"CD3D role in cardiomyocytes is atypical and not independently confirmed\", \"Relevance to T-cell biology unclear\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How CD3δ's extracellular/transmembrane domains structurally transmit the ERK-selective signal that drives positive selection, and the precise molecular interface with CD8αβ, remain undefined.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No atomic-resolution structure of the signaling-competent CD3δ interface in the corpus\", \"Mechanism of ERK pathway selectivity unresolved\", \"CD3δ–CD8αβ contact residues unmapped\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [8, 5]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [2, 9]},\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [0, 14]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [5, 9, 14]},\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [3, 10, 2]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [4, 8, 13]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [4, 13]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [8, 9]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [2, 3, 10]}\n    ],\n    \"complexes\": [\n      \"TCR/CD3 complex\",\n      \"pre-TCR complex\",\n      \"CD3δε dimer\"\n    ],\n    \"partners\": [\n      \"CD3E\",\n      \"TRA (TCRα)\",\n      \"CANX (calnexin)\",\n      \"CD8A\",\n      \"CD8B\",\n      \"RAF1\",\n      \"TRIM13\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":8,"faith_total":8,"faith_pct":100.0}}