guanosine 5'-o- ( 3-thiotriphosphate ) ( gtp gamma s ) was the most potent guanine nucleotide with a half-maximal stimulation at 1-10 microm , followed by guanosine 5'- ( beta , gamma-imido ) triphosphate greater than gtp greater than gdp = guanosine 5'-o- ( 2-thiodiphosphate ) .
C0079469
gtp gamma s
C0018353
gtp