title: A new lymphocyte-activating determinant locus expressed on T cells, and mapping in I-C subregion.
abstract: A new lymphocyte-activating determinant (Lad) locus expressed on T cells was identified, mapping in the I-C subregions of H-2k and H-2d haplotypes. The mixed lymphocyte reaction stimulation could be inhibited by anti-Ia sera made in strains incompatible for this chromosomal segment. Experiments with purified lymphocyte cell populations suggested that this Lad locus was expressed on T cells. Further, only purified T cells were able to remove the inhibiting activity from the anti-Ia sera. I-C subregion gene(s) seem to code for products selectively expressed on a subpopulation of T cells.
mesh_terms: D000818:Animals; D000937:Antigen-Antibody Reactions; D001402:B-Lymphocytes / Q000276:immunology; D002874:Chromosome Mapping; D000939:Epitopes; D005802:Genes, MHC Class II; D006183:H-2 Antigens; D007111:Immunity, Cellular; D007518:Isoantibodies; D007519:Isoantigens; D008198:Lymph Nodes / Q000276:immunology; D007959:Lymphocyte Culture Test, Mixed; D051379:Mice; D013154:Spleen / Q000276:immunology; D013601:T-Lymphocytes / Q000276:immunology*
chemical_list: D000939:Epitopes; D006183:H-2 Antigens; D007518:Isoantibodies; D007519:Isoantigens