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“The observation that morphine reduces PP output, both the basal value and that elicited by a parenteral stimulus, indicates that this effect is independent of its action on the gastrointestinal tract.”
Metabolism: clinical and experimental • 1983 | View Paper
“It has been reported that morphine abolished the plasma pancreatic polypeptide ( PP ) response to a meal in man, but the mechanism of this action is unclear.”
The Journal of pharmacology and experimental therapeutics • 1982 | View Paper
“3) Other polypeptides appear to act via different mechanisms so as to mimic or antagonize the actions of morphine , or to influence the body's response to morphine. (”
“Abstract (1) There is a variety of naturally occurring polypeptides that influence the actions of morphine. (”