the inhibitory effects of verapamil or of ca ( 2+ ) omission from the medium were not overcome by the phosphodiesterase inhibitor 3-isobutyl-1-methylxanthine ( 0.25mm ) , or by cholera toxin , or by an exogenously supplied cyclic amp analogue , 8-bromo cyclic amp .
C0001455
cyclic amp
C0000661
8-bromo cyclic amp