The thymus as an 'instructor'.
D000818:Animals; D006649:Histocompatibility Antigens; D006801:Humans; D007109:Immunity; D007111:Immunity, Cellular; D008214:Lymphocytes / Q000276:immunology; D051379:Mice; D013947:Thymosin / Q000276:immunology; D013950:Thymus Gland / Q000502:physiology*
D006649:Histocompatibility Antigens; D013947:Thymosin