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Immunoassay reagents intended to perform qualitative and/or quantitative analyses on a body fluid sample (e.g., serum, plasma, urine) to determine either one or more of a group of protein hormones (e.g., vasoactive intestinal polypeptide) that are mostly secreted by the endocrine cells found throughout the gut mucosa. Gastrointestinal hormones influence motility, secretion, digestion, and absorption in the gut; many of these hormones are also present in the central nervous system.
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