Fig. 1.

Current–voltage relationship of K⁺ channel currents in cultured astrocytes.A, Representative tracings of voltage-dependent openings of two different amplitude single-channel K⁺currents recorded from excised inside-out patches of cultured brain astrocytes at various patch potentials using symmetrical KCl (145 mm). c represents the closed state of the channel. B, Mean current–voltage relationship of the two single-channel K⁺ current types determined in 4–18 cells revealed unitary slope conductance of 71 ± 5 and 161 ± 9 pS for the small- and large-amplitude K⁺ currents, respectively. Vertical lines represent mean ± SEM.