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5 Hepes, 5 Glucose, 20 Sucrose, pH 7.4 with NaOH. Electrode intra-
cellular solution contained (mM): 140 KCl, 3 MgCl2, 5 EGTA, 5
Hepes, 2 ATP-Na, pH 7.3 with KOH. Drugs were applied directly
by gravity through a Y-tube perfusion system.53
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