Figure 5.

Forces exerted by cells that behaved badly. (a) A cell that stuck to the surface at the beginning of the rotations. This caused a transient decrease in force at the beginning of the forwards rotation and a transient increase in force at the beginning of the backwards rotation. (b) A cell that broke during backwards rotation at −1/8 Hz (open circles), following an earlier revolution at +1/8 Hz (filled circles). The break appears as a line from the largest to the smallest circle (open squares). This cell recovered partially before the final rotations at −1/4 Hz (open triangles).