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The reversal potential of photocurrents (A) and the time constant (τ) of the main (fast) component of photocurrent decay (B) in HcKCR1, CrChR2 and HcCCR measured at the indicated external pH. The bars are mean ± sem, the circles are the data from individual cells. Numerical data and full statistical analysis are provided in Supplementary Datasheet 2.
