The movement of the fluorescent-labeled actin filament was observed in 25 mM KCl, 20 mM MOPS-KOH (pH 7.5), 2 mM MgCl2, 1 mM EGTA, 1 mM dithiothreitol, 36 μg/ml catalase, 4.5 mg/ml glucose, 216 μg/ml glucose oxidase, 0.2 mg/ml calmodulin, and 2 mM MgATP at 25 °C. The error bars indicate S.D. for n=30-40 from three independent preparations.