A neuropeptide of the blowfly Calliphora vomitoria with an amino acid composition homologous with vertebrae pancreatic polypeptide.

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Abstract
A neuropeptide purified from the brain of the blowfly (Calliphora vomitoria) that cross-reacts in a bovine pancreatic polypeptide radioimmunoassay has been subjected to amino acid analysis. The amino acid composition of the peptide shows homology with vertebrate pancreatic polypeptide species. Amounts of the neuropeptide calculated from amino acid analysis record with those measured by the pancreatic polypeptide radioimmunoassay. These results suggest that the primary structure of the Calliphora neuropeptide is very similar to that of mammalian pancreatic polypeptides.