Miniature endplate current traces from individual diaphragm muscle fibers of wild type (A), δS262T (B), αC418W (C), αL251T (D), and εL269F (E). The prolonged and prominent bi-exponential decay phases correlate with the open times of the mutant channels expressed in the mice (Table 1). A, Average rise, 0.42 ± 0.47 msec; τs, 1.34 msec; amplitude (Amp), 4.15 ± 1.16 nA. B, Average rise, 0.32 ± 0.09 msec; τs = 2.34 msec; Amp, 2.69 ± 0.47 nA. C, Average rise, 0.25; τ1 = 1.52, τ2 = 9.89 msec; Amp, 3.48 nA. D, Average rise, 0.18 ± 0.14 msec; τ1 = 0.72 msec, τ2 = 8.37 msec; Amp, 3.31 ± 0.65 nA. E, Average rise, 0.37 ± 0.33 msec; τ1 = 0.17 msec, τ2 = 15.87 msec; Amp, 2.58 nA. Calibration: 1 nA, 15 msec.