study of the effect of nucleotides , such as gtp , guanosine 5'- ( 3-o-thio ) triphosphate , guanyl-5'-yl imidodiphosphate , and atp , on the activities of both isozymes with pip2 as substrate revealed that ( i ) in the absence of ca2+ , plc-i activity is enhanced by 400 % by either gtp or atp .
C0018366
guanyl-5
C0018353
gtp