Noun
tetrahydrobiopterin (uncountable)
English Wikipedia has an article on:tetrahydrobiopterinWikipedia
(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.
Tetrahydrobiopterin is a cofactor in the production of L-DOPA from tyrosine and 5-hydroxy-L-tryptophan from tryptophan, which must be supplemented as treatment in addition to the supplements for classical PKU. Source: Internet
Tetrahydrobiopterin deficiency can be caused by defects in four genes. Source: Internet