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The interactions among six neurotransmitter systems in the human brain form a fully connected network, which may be represented as a matrix. Arrows represent activation; while bar-headed lines represent inhibition. Abbreviation: dopamine (DA), acetylcholine (ACh), serotonin (5-HT), glutamate (Glu), noradrenaline (NA), and gamma-aminobutyric acid (GABA).
