title: Evolution of the vertebrate immune system.
mesh_terms: D000818:Animals; D005075:Biological Evolution; D007136:Immunoglobulins / Q000276:immunology; D007668:Kidney / Q000276:immunology; D008214:Lymphocytes / Q000276:immunology; D008221:Lymphoid Tissue / Q000276:immunology; D008285:Major Histocompatibility Complex; D010802:Phylogeny; D011947:Receptors, Antigen, B-Cell / Q000276:immunology; D013154:Spleen / Q000276:immunology; D013950:Thymus Gland / Q000276:immunology; D014714:Vertebrates / Q000276:immunology*
chemical_list: D007136:Immunoglobulins; D011947:Receptors, Antigen, B-Cell