title: Evidence for a common evolutionary origin of gastrin and cholecystokinin.
mesh_terms: D000595:Amino Acid Sequence; D000663:Amphibians; D000818:Animals; D005075:Biological Evolution; D001717:Birds; D001921:Brain / Q000378:metabolism; D002108:Ceruletide / Q000378:metabolism; D002766:Cholecystokinin / Q000276:immunology / Q000378:metabolism; D000939:Epitopes; D005399:Fishes; D005753:Gastric Mucosa / Q000378:metabolism; D005755:Gastrins / Q000276:immunology / Q000378:metabolism; D006801:Humans; D007413:Intestinal Mucosa / Q000378:metabolism; D008322:Mammals; D012104:Reptiles; D013045:Species Specificity
chemical_list: D000939:Epitopes; D005755:Gastrins; D002108:Ceruletide; D002766:Cholecystokinin