Fig. 6. Cells on smooth substrates had longer trajectories than cells on substrates with grooves and ridges on a 400 nm pitch. Cell trajectories correspond to the coordinates of the cells' centroids, recorded every 30 minutes from 2 hours until 12 hours after seeding. The units of the axes are micrometers. (A) The centroids of cells on patterned substrates were mostly stationary. (B) On smooth substrates cells had random trajectories.