Fig. 4.

A: current (I) and voltage (V) curve of the 20-pS K⁺ channel was configured in the primary culture mouse corneal epithelial cells. The experiments were perforated in cell-attached patches with 140 mM NaCl/5 mM KCl in the bath and 140 mM KCl in the pipette (n = 5). B: whole cell patch recording shows the Ba²⁺-sensitive K currents in the primary culture corneal epithelial cell from WT (Kcnj10^+/+) and Kcnj10^−/−, respectively. The pipette solution and the bath solution contained a symmetrical 140 mM KCl, and the K⁺ currents were measured from −100 to 100 mV by a RAMP program (n = 5).