title: Tetrahydrobiopterin in dihydropteridine reductase deficiency.
mesh_terms: D001708:Biopterins / Q000031:analogs & derivatives / Q000134:cerebrospinal fluid*; D006801:Humans; D009247:NADH, NADPH Oxidoreductases / Q000172:deficiency*; D010651:Phenylalanine Hydroxylase / Q000172:deficiency; D010661:Phenylketonurias; D011621:Pteridines / Q000134:cerebrospinal fluid*
chemical_list: D011621:Pteridines; D001708:Biopterins; D010651:Phenylalanine Hydroxylase; D009247:NADH, NADPH Oxidoreductases; C003402:sapropterin