Mice were dark adapted for over 16 hours. After deep anesthesia, pupils were dilated with an eye drop containing phenylephrine hydrochloride (5 mg/ml) and tropicamide (5 mg/ml). Full-field electroretinography was performed using the universal testing and electrophysiologic system 2000 (UTAS E-2000, LKC Technologies). The scotopic responses were recorded with a flash of 0 dB at a gain of 2 k using a notch filter at 60 Hz and were bandpass filtered between 0.1 and 1500 Hz. The amplitudes of the a-wave were measured from the baseline to the lowest negative-going voltage, whereas the peak b-wave amplitudes were estimated from the trough of the a-wave to the highest peak of the positive b-wave.

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