FIG. 13.

Induction of motility. (A) Cells have evacuated the pillars, leaving a hollow interior (arrow). (Reprinted from reference 281 with permission.) (B) Motile cells inside a wall of stationary cells. The white arrow points to the inside of the pillars where cells have gained motility. Motility is indicated by the blur in the image. The black arrow points to the “walls” of the pillars that are formed by cells that show no motility (see also the first movie in the supplemental material of reference 258). (Reprinted from reference 258 with permission of the publisher.)