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Reagents intended to establish points of reference (i.e., calibrate) in immunoassay tests performed to determine either one or more of a group of gastrointestinal hormones (e.g., vasoactive intestinal polypeptide). These reagents may be either specific for calibration of a gastrointestinal hormone or, more frequently, appropriate to calibrate a whole set of similar gastrointestinal hormones.
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