Proliferation of MAGIC-5 cells in response to electrical stimulation. MAGIC-5 cells were cultured for 3 h at 37°C on PLL-coated ITO electrodes. The cells were stimulated by a d.c. potential of 1.0 V (vs. Ag/AgCl) for different time periods (2, 3, 5 and 7.5 min) and then cultured for 3 days. Proliferation of cells was measured using a Cell Counting Kit. Data represent the geometric means of triplicate determinations.