Fig. 2. (A–C) Time courses of the electrical potential difference (V_te) across three different, perfused, whole posterior gills, demonstrating examples of the different responses to ouabain (2 mmol l^–1, black bars) added to the perfusate. V_te was measured as the external potential with respect to the internal medium. An identical NaCl saline was used in the bath and perfusate.

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