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Representative traces of the voltage-gated Na+ currents for a control and a CCD neuron. A and B: total Na+ currents were obtained using a series of 80-ms test pulses in 10-mV steps from −100 to 50 mV, preceded by a 500-ms prepulse of −100 mV. C and D: TTX-resistant (TTX-R) currents were recorded in response to the same series of test pulses but preceded by a 500-ms prepulse of −50 mV. E and F: TTX-sensitive (TTX-S) currents were obtained by subtraction of C and D from A and B.
