title: Antigen competition: evolutionary and functional considerations in amphibia.
mesh_terms: D000818:Animals; D000941:Antigens; D005075:Biological Evolution; D002244:Carbon / Q000494:pharmacology; D003102:Colloids; D004306:Dose-Response Relationship, Immunologic; D004912:Erythrocytes / Q000276:immunology; D006736:Horses; D012455:Salamandridae / Q000276:immunology*; D012756:Sheep; D013934:Thymectomy; D014301:Trinitrobenzenes / Q000276:immunology; D014562:Caudata / Q000276:immunology*; D014981:Xenopus / Q000276:immunology*
chemical_list: D000941:Antigens; D003102:Colloids; D014301:Trinitrobenzenes; D002244:Carbon