Statistical comparison of TTX effects. Effect of TTX on the (A) amplitude, (B) trough, and (C) distribution of phase expressed in SD are analyzed on the pretreat, first day, and third day of TTX treatment. Data are expressed as the mean ± SD *P < 0.05, **P < 0.01, ***P < 0.001. n = 4 slices. See legend of Fig. 2 for details.