Figure 2.

CO2 flux across the apical and basolateral membranes. (A) 13% CO2-equilibrated Ringer was perfused into the apical or basal bath. (B) 1% equilibrated Ringer was perfused into the apical or basal bath. The solid bars above the graph represent the beginning and end of a solution change (from control Ringer). The alteration in Ringer composition or the addition of drugs is indicated on the label above the solid bars. The time bar applies to pHi, TEP, and RT measurements and is located under the TEP/RT panels. In each experiment, pHi, TEP, and RT were measured simultaneously.

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