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Fig. 6. Time courses of the transepithelial voltage normalized to the percentage of
the control value (29 mV and 58 mV, respectively), showing the
effects of DPC (0.5 mmol l-1) during time period 1 and of DIDS (0.1
mmol l-1) during time period 2. During the time periods denoted w,
perfusion of the preparation was changed to withdrawal mode, establishing the
bathing solution also on the luminal side of the epithelium. Infusion mode was
used during the rest of the time.