Figure 8: Stability of time-averaged position in individual myosin heads in the absence of ATP. (A) comparison of myosin head positions between the two IP records of the same filament. Open and filled circles (diameter, 20nm)are drawn around the center of mass position of each gold particle, serving to position-mark each myosin head, in the first and the second IP records, respectively. In this and subsequent figures, broken lines indicate contour of myosin filament. Note that filled circles are barely visible due to almost complete overlap of open circles over filled circles. (B) Histogram showing distribution of distances between the center of mass positions of particles in the first and the second IP records [24].