Abstract

γ-Aminobutyric acid (GABA) and glycine levels in rat cerebral cortical superfusates rose during a 10-min period to reach stable concentrations of ∼0.55 μM and ∼12.3 μM, respectively. In cerebrospinal fluid withdrawn from the fourth ventricle, the GABA concentration was 0.1 μM, and that of glycine, 10.55 μM. GABA, and to a lesser extent glycine, concentrations increased in the cortical superfusates during and immediately following exposure of the rats to a 5-min period of 5% oxygen in nitrogen inhalation.

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