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Structural similarities of members of the CCK/gastrin peptide family: CCK, gastrin and the amphibian skin peptide caerulein. All of these peptides share a common feature, the same amidated tetrapeptide Trp-Met-Asp-Phe-NH2 at the C-terminal. The characteristic CCK-like activity depends on the sulfated Tyr residue at the seventh position.
