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Fig. 4

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ZDB-IMAGE-161205-49
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Fig. 4

The effects of accelerated synaptic current decay on membrane repolarization. (A) Muscle cell voltage responses to the single firing of a motor neuron. Between 12 and 20 individual muscle responses were averaged to generate the average waveforms corresponding to 48-hpf wild-type (WT; gray), 48-hpf twi+/− (black), and 120-hpf twi+/− (red) fish. The scale bar represents 10 mV and 10 ms. (B) Comparison of the repolarization time course among 48-hpf wild-type (gray), 48-hpf twi+/− (black), and 120-hpf (red) twi+/− animals. (C) Sample traces for the first three sequential muscle responses to motor neuron firing at 20 Hz. Repolarization was incomplete for both 48-hpf (black traces) and 120-hpf (red traces) twi+/− fish. However, the take-off level for responses 2 and 3 was much more positive at 48 hpf.

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