A question of memory.
D000818:Animals; D000917:Antibody Formation; D000941:Antigens / Q000276:immunology; D007111:Immunity, Cellular; D007156:Immunologic Memory; D007448:Invertebrates / Q000276:immunology; D008322:Mammals / Q000276:immunology; D011506:Proteins / Q000276:immunology; D014181:Transplantation Immunology; D014184:Transplantation, Homologous; D014714:Vertebrates / Q000276:immunology
D000941:Antigens; D011506:Proteins