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Effects of charged amino acids in the KcsA cytoplasmic domain on gating. A neutral mutant was made by replacing negatively charged amino acids in the cytoplasmic domain with neutral ones. The activity was then measured. (A) Amino acid sequences of the cytoplasmic domain and the neutral mutant. Shaded letters indicate replaced amino acids. (B) Representative current records at pH 4, 7, and 9, and 40 mV.
