The voltage clamp protocol is shown above B. The solutions contained 10 μm Gd3+. A, current traces recorded with 125.6 mm Cl− in the bath solution. B, current traces recorded with 30.6 mm Cl− in the bath solution. C, instantaneous current-voltage relationships measured at the onset of the voltage step after the −120 mV hyperpolarizing pulse. ▪, 125.6 mm Cl−. ○, 30.6 mm Cl−. Typical of 3 experiments.