TEVC of LP Ih. A, Typical LP Ih recording. Top, Current traces. Bottom, Voltage protocol. Calibration: 1 s, 10 nA. B, Ih Voltage dependence of activation. Plots of peak conductance versus voltage were fitted with a Boltzmann equation to obtain Ih Gmax. C, Ih is not contaminated with other inward currents. Representative traces measured before and after application of the selective inhibitor, ZD7288. Calibration: 1 s, 10 nA.