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Traces were smoothed using a 10 ms window, aligned to the first spike (asterisk) and scaled so that the passive voltage trajectory (dashed line) was the same in all traces. The top trace corresponds to a mutant superoxide dismutase 1 motoneurone that was able to produce repetitive firing (same motoneurone as in Figs 2A and 3Cb), the middle trace is from a wild-type motoneurone (same motoneurone as in Fig. 3Ca), and the bottom trace is from the motoneurone in Fig. 5Aa.
