crf-stimulated adenylate cyclase activity was evident in the presence of guanosine-5'-triphosphate ( gtp ) and its precursor guanosine-5'-diphosphate ( gdp ) but was not detected in the presence of the hydrolysis-resistant gtp analogs , guanyl-5'-imidodiphosphate [ gpp ( nh ) p ] and guanosine-5'-gamma-thiotriphosphate ( gtp-gamma-s ) .
C0018353
gtp
C0018366
gpp ( nh ) p