title: Possible evolution of acquired immunity from self-recognition structures.
mesh_terms: D000818:Animals; D000906:Antibodies; D005075:Biological Evolution; D000939:Epitopes; D005838:Genotype; D006801:Humans; D007109:Immunity; D007125:Immunogenetics; D008214:Lymphocytes / Q000276:immunology; D051379:Mice
chemical_list: D000906:Antibodies; D000939:Epitopes