title: Contemporary concepts of antigenic variation.
mesh_terms: D000818:Animals; D000941:Antigens; D001419:Bacteria / Q000235:genetics / Q000276:immunology; D014644:Genetic Variation; D006801:Humans; D007239:Infections / Q000276:immunology; D010271:Parasites / Q000235:genetics / Q000276:immunology; D013045:Species Specificity; D014780:Viruses / Q000235:genetics / Q000276:immunology
chemical_list: D000941:Antigens