title: Some new concepts in immunological phylogeny.
mesh_terms: D000663:Amphibians; D000818:Animals; D000845:Annelida; D000917:Antibody Formation; D001402:B-Lymphocytes / Q000276:immunology; D005075:Biological Evolution; D003063:Cnidaria; D004447:Echinodermata; D005399:Fishes; D006648:Histocompatibility; D007109:Immunity; D007111:Immunity, Cellular; D007156:Immunologic Memory; D007448:Invertebrates; D008322:Mammals; D013045:Species Specificity; D013601:T-Lymphocytes; D014181:Transplantation Immunology; D014714:Vertebrates