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Reconstructions of F-actin and cofilin/actin filaments demonstrating the change in crossover length. (a) Platelet F-actin exhibiting 54/25 symmetry, equivalent to 2.160 subunits per turn. (b) Cofilin/F-actin exhibiting 20/9 symmetry (2.222 subunits per turn). Arrows mark the crossover length. There are 40 actin subunits in each filament.
