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The dependence of the amplitude of photoreceptor currents in ChR1-enriched (filled circles) and ChR2-enriched (open squares) Chlamydomonas reinhardtii RNAi transformants on external pH. The proton electrochemical potential across the plasma membrane was calculated assuming that the intracellular pH is 7.4 (53), and taking into account the pH dependence of the resting membrane potential measured with permeable lipophilic cations (47).
