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The ability to detect neurotransmitters in the human serum environment rapidly, extremely sensitively, and selectively is critical for clinical biology.

The part of the brain most important in regulating sleep duration is the hypothalamus. Certain groups of hypothalamic neurons and adjacent groups of basal forebrain neurons produce the neurotransmitter gamma-aminobutyric acid (GABA). Projections of these GABA neurons inhibit the firing of cells involved in wakefulness. Several groups of neurons have been shown to be inhibited by this action--in...