Cholecystokinin tetrapeptide (CCK-4, tetragastrin, Trp-Met-Asp-Phe-NH2) is a peptide fragment derived from the larger peptide hormone cholecystokinin. Unlike cholecystokin which has a variety of roles in the gastrointestinal system as well as central nervous system effects, CCK-4 acts primarily in the brain as an anxiogenic, although it does retain some GI effects, but not as much as CCK-8 or the full length polypeptide CCK-58.
{{Drugbox | Verifiedfields = changed | Watchedfields = changed | verifiedrevid = 431772029 | IUPAC_name = (3S)-3-[(2S)-2-amino-3-phenylpropanamido]-3-{[(1S)-1-{[(1S)-1-carboxy -2-(indol-3-yl)ethyl]carbamoyl}-3-(methylsulfanyl)propyl]carbamoyl}propanoic acid | image = Cck-4.svg | image_class = skin-invert-image | width = 240
| tradename = | pregnancy_AU = | pregnancy_US = | pregnancy_category = | legal_AU = | legal_CA = | legal_UK = | legal_US = | legal_status = | routes_of_administration = Intravenous
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).