activation of the endogenous adenylate cyclase of pyramidal cells either by intracellular injection of the stable guanosine 5'-triphosphate ( gtp ) analogue guanylyl-imidodiphosphate , or by extracellular application of forskolin , reduced the a.h.p . and accommodation .
C0018353
guanosine
C0018366
guanylyl-imidodiphosphate