<p>A) Representative confocal images of F-actin (5 µM), assembled without (upper panels) or with Tpm1 (lower panels), after incubation with 50 nM Cof1 for lengths of time as indicated (see <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0003641#s4" target="_blank">Materials and Methods</a> for more details). B) Representative confocal images of F-actin (5 µM), assembled without (upper panels) or with 5 µM Tpm1 (lower panels), after incubation with 50 nM Cof1-5 (left panels) or Cof1-22 (right panels) for 2 min. C) Measurements of actin filaments length from images recorded in experiments in (A) and (B). Shown are averages of filament length measurements from three fields per sample with error bars representing standard deviations. D) Representative confocal images of F-actin (5 µM), assembled with 5 µM Tpm1, after incubation with 50 nM Cof1-22 for lengths of time as indicated.</p