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. 1997 Oct 1;110(4):467–483. doi: 10.1085/jgp.110.4.467

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Removing external Na⁺ from hippocampal astrocytes exposed to a 20% CO₂/68 mM HCO₃ ⁻-buffered solution elicits a mean depolarization that is larger than that observed for cells exposed to (a) a HEPES-buffered solution, or (b) a 20% CO₂/68 mM HCO₃ ⁻-buffered solution containing 400 μM DIDS.