as a result of studies on different preparations , it is concluded that light can cause both rapid ( within 50 msec ) and slow ( within 90 sec ) changes in the turbidity of visual membranes , not associated with permeability changes , and that they are affected by gtp or its analog guanyl-5'-yl imidodiphosphate ;
C0018353
gtp
C0018366
guanyl-5