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Electropherograms collected from the same rat during episodes of (a) wakefulness (WAKE), (b) NREM sleep, and (c) REM sleep. Glutamate (Glu), aspartate (Asp), GABA, taurine (Tau), serine (Ser), and glycine (Gly) were separated and detected within 11 s of sample injection. The inset over each electropherogram magnifies the GABA peak (arrow).
