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Injection of 3 Hz sinusoidal current (15 pA) into an OFF bipolar cell produced only modest nonlinearities in the resulting voltage change. Note the small harmonics at 6 and 9 Hz in the FFT (left). The FFT was calculated from the average of eight trials. A segment of the average voltage waveform is also shown (right). Mean membrane potential was −48.6 mV.
