Fig. 9. Screen shot showing intracellular free-calcium measurement of 6 cells (A-F) exposed to a 10-V/cm electric field. The field was applied at 25.76 seconds (first bar). Times for the onset of calcium rise were 34 seconds for A, 61 seconds for B, 37 seconds for C, 196 seconds for D, 65 seconds for E and 76 seconds for F.