Tags: Protein.
Xenin is a peptide hormone produced by a subpopulation of chromogranin A-positive endocrine cells in the mucous membrane of the duodenum. The peptide has been found in humans dogs pigs rats and rabbits.In humans xenin circulates in the blood plasma. There is a relationship between peaks of xenin concentration in the plasma and the third phase of the Migrating Motor Complex. For example infusion of synthetic xenin in fasting volunteers will cause phase III activity.