Fig. 1. Typical time-lapse photographs showing translocation of MAT-LyLu (A,B) and AT-2 (C,D) cells in electric fields (3 V cm^-1); polarity indicated with `+' (anode) and `-' (cathode). (A) Image of MAT-LyLu cells immediately after turning the electric field on (time=0), with the positions of three typical cells indicated (1-3). (B) The same field of view as in (A) taken 2 hours later. It is clear that the cells have moved significantly towards the cathode. (C) Images of AT-2 cells at time=0, with the positions of three cells indicated (1-3). The same field of view as in (C) taken 2 hours later, indicating insignificant movement of cells. Bars, 100 µm.