Figure 4. Migration speed of mouse corneal epithelial cells on different substrates. Tracks of cells were measured with time-lapse microscopy over 24 h culture and the mean total distance migrated ± standard error of the mean (SEM) is presented. From left to right: wild-type cells on tissue culture plastic coated with poly-L-lysine; wild-type cells on tissue culture plastic coated with laminin; wild-type cells on wild-type corneas de-epithelialized by scraping; Pax6^+/− cells on wild-type corneas de-epithelialized by scraping.