Figure 1: The hydroxylation or serotonin pathway in brain and melatonin pathway in pineal.
Abbreviations used are: AANAT (arylalkylamine N-acetyltransferase), ALAAD (aromatic
L-amino acid decarboxylase), ALDH (aldehyde dehydrogenase), BH2 and BH4 (dihydro-
and tetrahydro-biopterin), HIOMT (hydoxyindole-O-methyltransferase), MAO (monoamine
oxidase), PLP (pyridoxal 5'-phosphate), TPH (tryptophan hydroxylase).
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