Xenin plasma concentrations during modified sham feeding and during meals of different composition demonstrated by radioimmunoassay and chromatography.

Unlabelled: Xenin is a 25 amino acid peptide produced by specific endocrine cells of the duodenal mucosa. Xenin has multiple biological actions in the gastrointestinal tract. It modulates intestinal motility, affects exocrine pancreatic secretion, and gastric secretion of acid.