the data concerning atp splitting are consistent with the assumption ( a ) that only 1 out of every 3 actin units of the filaments needs to be combined with phalloidin in order to suppress the contribution of these 3 actins to the atpase activity of the filament and ( b ) that all actin units of the filaments can combine with phalloidin with a very high affinity .
C0001271
actins
C0025979
actin