Introduction The pancreatic polypeptide (PP) family includes three endogenous peptides: PP, peptides-neuropeptide Y (NYP) and peptide YY (PYY)-all of which have been localized to both central and peripheral tissues. Pancreatic polypeptide (PP) was first isolated as a by-product of insulin from avian species. Subsequent to this finding, were the discoveries of two other related...