abnormal pancreas secretion abnormal PP cell physiology abnormal pancreatic polypeptide secretion MP:0009197 MPheno.ontology abnormal PP secretion abnormal pancreatic polypeptide hormone secretion abnormal pancreatic prohormone secretion anomaly in the production and/or regulated release 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