Fig. 5

Action potential-evoked Ca2+ influx. a A representative experiment showing the averaged Ca2+ response (n = 9 cells) to Ca2+-free solution, 0.3 μM TTX, and increasing concentrations of nimodipine in the presence of TTX. b Statistics showing the percent block by TTX and increasing concentrations of nimodipine in TTX of basal Ca2+ influx as determined by Ca2+-free (0-Ca2+) solution (n = 121 cells). c A representative experiment showing the averaged Ca2+ response (n = 8 cells) to 0.3 μM TTX in the absence and then presence of 2 μM nimodipine. *** P < 0.001