part of part of has part has part has_part characteristic of has modifier abnormal circulating pancreatic peptide level decreased circulating pancreatic peptide level 2024-10-16T18:00:53Z MP:0014568 less than the expected amount in the blood of the 36-amino acid pancreatic hormone that is secreted mainly by endocrine cells found at the periphery of the islets of Langerhans in response to ingestions, and regulates gastric secretion, gastric emptying, pancreatic enzyme secretion, and appetite reduced blood PPY amount abnormal decreased amount pancreatic polypeptide prohormone blood