Fig. 4. A typical result showing the reversibility of the effect of an applied electric field (3 V cm^-1) on the galvanotactic response of MAT-LyLu cells. The graph shows the plot of the average cosine of directional segmental angle ß calculated from 50 trajectories against time. The segment corresponds to the distance covered by the cell in 10 minute intervals. The field was reversed after 3 hours of recording, at the point marked by the arrow. Positive values of ß corespond to cathodal movement of cells.