a small and limited amount of exchange of actin filament subunits for unpolymerized actin or subunits in other filaments has been measured by three techniques : fluorescence energy transfer , incorporation of 35s-labelled actin monomers into unlabelled actin filaments , and exchange of [ 14c ] atp with filament-bound adp .
C0001271
actin
C0025979
actin filaments