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. 1998 Oct 1;112(4):391–408. doi: 10.1085/jgp.112.4.391

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Effects of changing CaCl₂ concentration on TMRM fluorescence near the S4 segment. (top) Fluorescence intensity for M356C W434F, taken at the end of a 40-ms pulse from a holding potential of −90 mV, in the presence of 2 (•) and 20 (▿) mM CaCl₂ for the same oocyte. (bottom) Fluorescence intensity for A359C W434F, taken at the end of a 40-ms pulse from a holding potential of −90 mV, in the presence of 2 (•) and 20 (▿) mM CaCl₂ for the same oocyte.