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Coupled absorption of NaCl in hyperosmoregulating species characterized by “leaky” gill epithelia. Representative time-course of the short-circuit current (Isc), showing the effects of either Na+ substitution (choline) or Cl− substitution (gluconates) on both sides of a split gill lamella of the shore crab Carcinus maenas. Current deflections are due to 5 mV voltage pulses and are directly proportional to the transepithelial conductance (from Onken and Siebers, 1992).
