Fig. 4.

Biophysical properties of rTASK currents inXenopus oocytes studied with two-electrode voltage clamp. A, Reversal potential as a function of extracellular K⁺ for rTASK-expressing oocytes. Reversal potential changed by 54 ± 3 mV per 10-fold change in extracellular K⁺, as estimated with linear regression (regression line shown). B, Whole-cell current–voltage relation with either 5 mm(filled circles) or 100 mm(open circles) extracellular K⁺. The current–voltage relations for an open K⁺-selective channel estimated from the Goldman–Hodgkin–Katz current equation are drawn as solid lines.