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The resting potential of the plasma membrane of characean internodal cells and squid axons is approximately -0.
K] inactivation cannot account for the destabilization of the resting potential illustrated in Figure IC, which we believe is the key feature underlying our results.
The results show that the photoreceptors have cell resting potentials of about -49 [+ or -] 7 mV and respond to a flash of light with a depolarization consisting of a transient component, often accompanied by a burst of action potentials, followed by a steady-state or plateau depolarization.
No significant current appears in response to the test pulse after prepulses more positive than -40 mV; this putative A current response to the test pulse is activated following a -60-mV prepulse, a value close to the resting potential of the hair cell.