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. 1998 Nov 2;143(3):767–775. doi: 10.1083/jcb.143.3.767

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(A) Current–voltage relationships obtained from the same oocyte before (open circles) and after (filled circles) treatment with 20 μg/ ml progesterone in NFR. The current amplitudes were determined by depolarizing pulses from a holding potential of −100 mV to voltages ranging between −60 and +80 mV in 20-mV steps. The amplitude was measured as mean steady-state current at the final 10% of a 500-ms pulse. (B) Current elicited by a 20-s depolarization to +80 mV from an oocyte expressing rectifying currents. (C) Normalized current obtained during different frequency and/or voltage stimulations (open circles, 2 Hz, +60 mV; filled triangles, 2 Hz, 0 mV; open squares, 4 Hz, +60 mV).