MLC activation promotes cell migration. (A) Velocities of control and MLC-DD-expressing CHO.K1 cells migrating on fibronectin. Data are box plots, which have the median value and extreme values, as well as the quartile distribution (boxed regions) of velocities of control (n = 22) and MLC-DD (n = 24) expressing cells from five independent experiments. (B and C) Migratory behavior of control (B) and MLC-DD (C) expressing CHO.K1 cells. The plots are cell tracks, derived from 6–10 h phase-contrast videos, translated to a common origin. Distance is in micrometers.