Single channel properties of Cx26 channels. Voltage protocol (top) and single channel currents recorded from homotypic Cx26 cell pairs with pipette solutions of different ionic compositions. Top: K+ aspartate− pipette solution. Transjuctional voltage Vj= 110 mV, the current histograms yielded γj of 111pS/109 pS for negative/positive Vj. Bottom: Na+ aspartate− pipette solution, Vj= 90 mV, γj = 83 pS/85 pS for negative/positive Vj.