<p>A. Typical families of current traces recorded at 37°C from Kv11.1-1A (left) and Kv11.1-3.1 (right) showing the last 100–150 ms of the activating step and 500 ms of the tail current recorded at −60 mV. Arrow indicates position where peak tail current was recorded. Inset at top of panel shows voltage protocol used to measure steady-state activation. B. Normalized peak tail currents plotted against voltages of the preceding test pulse for Kv11.1-1A (○) and Kv11.1-3.1 (•). Solid lines are fits of the Boltzmann function (see Eq. 1) giving V<sub>0.5</sub> for steady-state activation of −31.4±1 mV for Kv11.1-1A and −35±1 mV for Kv11.1-3.1 (P<0.05).</p
