Figure 6

Overlays of selected frames at 0.17 s intervals out of a 3-second movie, to illustrate switches during the motion of Δpilin (left panels) and wild-type (right panels) cells in PYE (top panels) and 4% PEG 35000 (bottom panels). The faint grey lines following the swimming trajectories were produced with darkened overlay of all frames over the 3-second movies at 125 frames/second. Arrows next to the trajectories were drawn to point out the directions of motion, with switches indicated by grey circles. The scale bar applies to all 4 images.