Movie S4.

Phase contrast image sequence of reversal behaviors upon collisions with other cells or non-biological obstacles (glass microfibers). WT P. aeruginosa cells reverse both after collision with other cells as well as after collisions with a glass microfiber. White triangles indicate collisions with another cell, black triangles indicate collisions with a fiber. Videos correspond to images in Fig. 2D. Scalebar, 2 μm.