Miniature synaptic responses in NMJ of Ctrl, N-dCKO, and M-dCKO mice. A, Representative traces of mEPPs. Calibration: 1 mV, 0.5 s. B, Pooled data indicate significant reductions in the frequency of mEPPs in N-dCKO (N = 14) and M-dCKO (N = 31) NMJs compared with controls (N = 31). C, mEPP amplitude showed no significant differences among three groups tested. Data are presented as mean ± SEM. *p < 0.05; **p < 0.01 (one-way ANOVA).