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Action spectra of channel currents generated in HEK293 cells by wild-type PsChR and its mutants at the bath pH 7.4 (A), wild-type CrChR2 and its mutants at the bath pH 7.4 (B), and wild-type PsChR at the bath pH indicated in the legend (C). The data points are the mean values of three to five measurements. rel. u., relative unit.
