Fig. 6. The migration speed (µm/hour) and FMI values under different conditions. The cell migration speed was calculated for each lapse interval and the mean speed was derived for a period of 6 hours. Data are shown as mean ± s.e.m. from at least three independent experiments (the numbers of the counted cells were indicated in Fig. 4). FMI values can be either positive or negative, depending on the direction in which cells migrate (see Materials and Methods). PL, poly-L-lysine. *P<0.01 by two-tailed unpaired t-test, significantly different from chemokinesis or chemotaxis with Endo N.