Source:http://linkedlifedata.com/resource/umls/id/C1157041
GO: The chemical reactions and pathways resulting in the formation of tetrahydrobiopterin, the reduced form of biopterin (2-amino-4-hydroxy-6-(1,2-dihydroxypropyl)-pteridine). It functions as a hydroxylation coenzyme, e.g. in the conversion of phenylalanine to tyrosine. [CHEBI:15372, GOC:go_curators, ISBN:0198506732]