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Mechanisms and development of pancreas and pancreatic secretory function were studied in the rat. Injections of cholecystokinin octapeptide and hydrocortisone into pregnant rats altered pancreatic size, zymogen enzyme, and DNA content in the fetal newborn pancreas. These studies suggest that the developmental signals for pancreatic function may be related to endogenous release of cholecystokinin or hydrocortisone in the perinatal period.

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