since the added s-1 can interact only with the bare actin protomers within the cross-linked actin filament , the difference , delta v = vy - vx - vs ( where vs is the atpase activity of the additional s-1 alone ) , can indicate the state of the bare actin protomers while the cross-linked acto-s-1 is hydrolyzing atp .
C0025979
actin filament
C0001271
actin