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Three kinetic components of outer hair cell (OHC) outward IK are identified. Cells were held at −80 mV and stepped up to +40 mV for 5 s. A: only fast component, transient outward K+ current (Ito). B: Ito + Ik1 (K+ current of slow component 1) components. C: Ito + Ik2 (K+ current of slow component 2) components. D: the ratio of different components of IK. Horizontal solid lines on left of traces depict zero current levels.
