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Peptide YY
  1. Structure
It is a polypeptide having 36 amino acids. It is closely related to pancreatic polypeptide and to neuropeptide Y (which is found in the brain and autonomic nervous system). All these peptides end in tyrosine and are Amidated at their carboxyl terminal.
  1. Site
It is secreted from the jejunum; its secretion is stimulated by fat
  1.  Actions
  • it inhibits food intake
  • it inhibits gastric acid secretion and motility

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