title: Evolutionary immunobiology and the problem of the T-cell receptor.
mesh_terms: D000486:Allergy and Immunology; D000663:Amphibians; D000818:Animals; D001402:B-Lymphocytes / Q000276:immunology; D001666:Binding Sites, Antibody; D005075:Biological Evolution; D001717:Birds; D005399:Fishes; D006241:Haptens; D008322:Mammals; D008934:Mitogens / Q000494:pharmacology; D010802:Phylogeny; D011947:Receptors, Antigen, B-Cell; D013601:T-Lymphocytes / Q000276:immunology*
chemical_list: D006241:Haptens; D008934:Mitogens; D011947:Receptors, Antigen, B-Cell