two synthetic analogs of cck-4 , glp-met-asp-phe-nh2 ( i ) and pro-met-asp-phe-nh2 ( ii ) reported earlier to stimulate insulin release from the isolated rat pancreatic islets in vitro at concentrations as low as 10 ( -10 ) m , have now been found to be totally ineffective as glucagon releasers at concentrations as high as 10 ( -6 ) m or higher .
C0021641
insulin
C0022131
pancreatic islets