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Fig. 2. (AD) Effect of anoxia, exposure to a high K+
concentration and forced energy deficiency on the extracellular level of GABA
and glutamate. In A,B, the filled circles represent the anoxia-exposed fish,
while open circles represent control fish kept in normoxia during the whole
experiment. Iodoacetate (IAA) was used to create energy deficiency during
anoxia. The horizontal lines mark the periods of anoxia (N2
exposure), when a high-K+ Ringer was pumped through the
microdialysis probe or when IAA was superfused onto the brain. Values are
means ± S.E.M. from 68 fish. Redrawn from Hylland and
Nilsson (1999).