Fig. S5.

Planarian crushing experiments. (A) Representative sequence of head pulses for a planarian whose tail is held underneath a 5-g weight. (Scale bar: 3 mm.) (B) Representative side-view sequence of a planarian lifting its head during pulsation. (Scale bar: 1 mm.) (C) Worm underneath weight as viewed from the bottom. (Scale bar: 1 mm.) (D) Head length as a function of time for a pulsation event, exhibiting logistic growth like during fission, but at a faster rate. (E) Head length as a function of time for multiple pulses. (F) Mean angle and range of angles observed for head lifting in weight experiments.