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Definition of Tetrahydrobiopterin
1. Noun. (biochemistry) A naturally-occurring nutrient and essential cofactor of the three aromatic amino acid hydroxylase enzymes, used in the biosynthesis of the neurotransmitters serotonin, melatonin, dopamine, norepinephrine, epinephrine, and nitric oxide. ¹
¹ Source: wiktionary.com