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pH dependence of KcsA. Currents were recorded at 200 mV in symmetrical 100-mM K+ solutions, with pH variation on cis and trans sides, as indicated. Channels were first recorded with pH 4 on both sides. The cis chamber was brought to pH 7, and more records were collected. After perfusion to pH 7 trans, where no openings were observed, the trans chamber was returned to pH 4 to confirm reversibility.
