in the presence of the stable gtp analog guanosine 5'-o- ( 3-thiotriphosphate ) ( 1 microm ) , which decreased the stimulated activity by about 40 % after a short lag period , somatostatin ( 1 microm ) did not cause a further decrease in final activity but reduced the lag period by about 50 % .
C0018353
gtp
C0079469
guanosine 5