Xenin stimulates exocrine pancreatic secretion. It inhibits pentagastrin-stimulated secretion of acid, to induce exocrine pancreatic secretion and to affect small and large intestinal motility. In the gut, xenin interacts with the neurotensin receptor. Oligomeric complex that consists of at least the alpha, beta, beta', gamma, delta, epsilon and zeta subunits. Probably interacts with PEX11A. Interacts with SCYL1. Interacts with JAGN1 (By similarity). Interacts with TMEM41B (By similarity). Gastric, duodenal and jejunal mucosa. Circulates in the blood. Seems to be confined to specific endocrine cells. Released into the circulation after a meal.