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Instantaneous currents through the plasma membrane of Arabidopsis root protoplasts in response to voltage-clamp steps (ΔE = 15 mV) from −160 to 80 mV (holding potential = −70 mV). Solutions contained 10, 20, or 100 mm NaCl. Data were obtained from the same protoplast (dp = 21 μm). Before recording, the cell was exposed to each NaCl concentration for 15 min. Concentrations are given in mm.
