title: The calcitonins: an example of unusual evolution.
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D005075:Biological Evolution; D002116:Calcitonin / Q000032:analysis*; D002417:Cattle; D005815:Genetic Code; D006801:Humans; D009154:Mutation; D010802:Phylogeny; D012474:Salmon; D012756:Sheep; D013045:Species Specificity; D013552:Swine
chemical_list: D002116:Calcitonin