Why the MHC is important to the immune system.
D000818:Animals; D000917:Antibody Formation; D006183:H-2 Antigens / Q000235:genetics / Q000276:immunology*; D007111:Immunity, Cellular; D008285:Major Histocompatibility Complex; D051379:Mice; D008815:Mice, Inbred Strains; D013601:T-Lymphocytes / Q000276:immunology
D006183:H-2 Antigens