without rhodopsin , labeling of t alpha ( in the presence of t beta gamma ) was unaffected by gpp ( nh ) p , guanosine 5'-o- ( thiotriphosphate ) ( gtp gamma s ) , gtp , gdp , and guanosine 5'-o- ( thiodiphosphate ) ( gdp beta s ) but was increased by atp .
C0018366
gpp ( nh ) p
C0018353
gtp