Humoral and cellular immunity and the lymphoid system.
D000818:Animals; D000917:Antibody Formation; D002060:Bursa of Fabricius / Q000276:immunology; D006801:Humans; D007109:Immunity; D008208:Lymphatic System / Q000276:immunology*; D008213:Lymphocyte Activation; D008214:Lymphocytes; D013950:Thymus Gland / Q000276:immunology; D014181:Transplantation Immunology