title: A defective enzyme in hyperphenylalaninaemia due to biopterin deficiency.
mesh_terms: D000293:Adolescent; D000328:Adult; D000429:Alcohol Oxidoreductases / Q000378:metabolism*; D001708:Biopterins / Q000031:analogs & derivatives / Q000172:deficiency* / Q000652:urine; D002648:Child; D002675:Child, Preschool; D004912:Erythrocytes / Q000201:enzymology; D005260:Female; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D008297:Male; D008875:Middle Aged; D009097:Multienzyme Complexes / Q000378:metabolism*; D019798:Neopterin; D010649:Phenylalanine / Q000097:blood*; D011621:Pteridines / Q000172:deficiency*
chemical_list: D009097:Multienzyme Complexes; D011621:Pteridines; D001708:Biopterins; D010649:Phenylalanine; D019798:Neopterin; D000429:Alcohol Oxidoreductases; C022631:sepiapterin synthase