Fig. 3. Original recording of short-circuit current (I_sc) from high-salinity-adapted integument. Adenosine (1 mmol l^-1) was added in increasing concentrations to the basolateral compartment to give the final concentrations (mmol l^-1) indicated. The current sensitive to 100 µmol l^-1 amiloride was determined before superfusion with Na⁺- free Ringer's solution; periods of superfusion are shown below the recording.