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FIGURE 2. Catecholamine and serotonin synthesis pathways. ADR = adrenaline; DA = dopamine; DBH = dopamine-β-hydroxylase; DOPAC = 3,4-dihydroxyphenylacetic acid; 5-HIAA = 5-hydroxyindolacetic acid; 5-HT = 5-hydroxytryptamine (serotonin); 5-HTP = 5-hydroxytryptophan; HVA = homovanillic acid; M = metanephrine; MAO = monoamine oxidase; MHPG = 3-methoxy-4-hydroxyphenylethylene glycol; 3-MT = 3-methoxytyramine; NM = normetanephrine; NORADR = noradrenaline; PHE = phenylalanine; PNMT = phenylethanolamine N-methyltransferase; TRP = tryptophan; TYR = tyrosine; VMA = vanillylmandelic acid.
