concentrations of cyclic amp ( adenosine 3':5'-cyclic monophosphate ) and rates of insulin release were measured in islets of langerhans isolated from rat pancreas and incubated for various times in the presence of glucose , 3-isobutyl-1-methylxanthine , caffeine , theophylline , adrenaline and diazoxide .
C0000096
3-isobutyl-1-methylxanthine
C0039771
theophylline