title: Immunology and the major histocompatibility system: introduction.
mesh_terms: D000939:Epitopes; D006680:HLA Antigens; D006649:Histocompatibility Antigens; D006801:Humans; D007109:Immunity; D007111:Immunity, Cellular; D009103:Multiple Sclerosis / Q000276:immunology*
chemical_list: D000939:Epitopes; D006680:HLA Antigens; D006649:Histocompatibility Antigens