Fig. 12. (A) Sequential phase-contrast images of a mechanically-dissociated slug cell that shows continual locomotion in a thin layer of phosphate buffer without quinine. Intervals between successive frames are 8.0 seconds. The mean velocity of the cell front is 0.76 µm/second. (B) Nomarski (top) and fluorescence (bottom) images of a dissociated slug cell with an elongated protrusion stained with fluorescent phalloidin. Bar, 10 µm.