Fig. S1. Verification of gap-junctional communication in HEK293T cells. Fig. S2. Calibration of calcein fluorescence and its dependence on the osmolarity of extracellular solutions. Fig. S3. The effect of Ba2+ on Kir4.1-activity. Fig. S4. Cholesterol dependence of the localization and activity of heteromeric Kir4.1/5.1 channels. Fig. S5. Ganglioside GM1 is not expressed in astrocytes.

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