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A method is described for isolation, from chicken pancreas, of an avian pancreatic polypeptide which may be a new hormone. This method involves acid-alcohol extraction, gel filtration, DEAE-cellulose chromatography, and droplet countercurrent distribution. The peptide contains 36 amino acids, has a molecular weight of 4240 and the isoelectric point if pH 6 to 7. The average amount of avian pancreatic polypeptide extractable from chicken pancreas was 4 mg/100 g of pancreas. The amino acid sequence of the peptide is Gly-Pro-Ser-Gln-Pro-Thr-Tyr-Pro-Gly-Asp-Asp-Ala-Pro-Val-Glu-Asp-Leu-Ile-Arg-Phe-Tyr-Asp-Asn-Leu-Gln-Gln-Tyr-Leu-Asn-Val-Val-Thr-Arg-His-Arg-Tyr-NH2.
Kimmel et al. (Mon,) studied this question.
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