Fig. 5. K⁺ currents at different voltages. (A) Whole-cell membrane currents in response to the step depolarisations (same pulse protocol as in Fig. 3A except that the pulse duration was increased to 25 ms). Eleven traces are superimposed. The bath solution was N-Ca-free-ASW containing 4 µmol l^–1 TTX and the pipette solution was K-asp. Cell membrane capacitance (C_m)=132.6 pF. (B) Membrane currents associated with depolarisations to +30 mV from three different holding potentials of –40 mV (square), –70 mV (circle) and –90 mV (triangle). (C) Current–voltage (I–V) relationships of the peak currents at three different holding potentials of –40 mV (open squares), –70 mV (open circles) and –90 mV (open triangles).