A. M. NOEL-ARTIS: L. HAUAD: J. LAUR: b~~~~~ uisi The dose-response curve for cholecystokinin (CCK)-stimulated enzyme secretion in isolated pancreatic acini from different species is biphasic. With increasing doses of CCK, amylase secretion increases to a maximum and then decreases at higher concentrations. The CCK analog Boc-Tyr(SO3H)-Nle-G1y-Trp-NIe-Asp-O-CH2-CH2-