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Diagram of the relationship between the synthesis and metabolism of dopamine. PH, phenylalanine hydroxylase; TH, tyrosine hydroxylase; l-DOPA, levo-dopa; AADC, aromatic L-amino acid decarboxylase; VMAT, vesicular monoamine transporter; LTP, Long-term potentiation; MAO, monoamine oxidase; DOPAC, 3,4-dihydroxyphenylacetic acid; COMT, catechol-o-methyltransferase.
