the nonhydrolyzable gtp analogs guanosine 5'-o- ( 3-thiotriphosphate ) ( ec50 = 3 nm ) and guanylyl-imidodiphosphate ( ec50 = 100 nm ) substituted for gtp in potentiating serotonin activation .
C0018366
guanylyl-imidodiphosphate
C0018353
gtp