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Structures and pathways of the neurotransmitters and their metabolites. (Trp, Tryptophan; 5-HT, Serotonin; 5-HIAA, 5-hydroxyindol acetic acid; Tyr, tyrosine; DA, dopamine; NE, norepinephrine; Glu, glutamic acid; GABA, γ-aminobutyric acid; Ach, acetylcholine; IS, isoprenaline.)
