Figure 4.
Figure 4. pH dependence of Cl− flux. Passive Cl− efflux of coupled transporters was assayed at the indicated pH and maintained symmetrically with citrate-phosphate buffer. (A) Normalized traces of Cl− efflux, as in Fig 3. (B) Initial rate of Cl− efflux is normalized to the pH 4.0 value for each transporter: circle, WT; triangle, H; inverted triangle, K.

pH dependence of Cl− flux. Passive Cl− efflux of coupled transporters was assayed at the indicated pH and maintained symmetrically with citrate-phosphate buffer. (A) Normalized traces of Cl− efflux, as in Fig 3. (B) Initial rate of Cl− efflux is normalized to the pH 4.0 value for each transporter: circle, WT; triangle, H; inverted triangle, K.

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