Circus movements and blebbing in a single neurectoderm cell at 2 hr in culture. A, Counterclockwise circus movements; phase-contrast images at 10 sec intervals. The cell demonstrated continuous counterclockwise behavior for 18 min.B, Clockwise circus movements, images at 10 sec intervals ∼17 min after images in A. C, Leftto right, Images at 2 min intervals of random blebbing. Scale bar, 25 μm.