title: Biosynthesis of tetrahydrobiopterin in parkinsonian human brain.
mesh_terms: D001708:Biopterins / Q000031:analogs & derivatives* / Q000096:biosynthesis; D001921:Brain / Q000473:pathology*; D006136:GTP Cyclohydrolase / Q000378:metabolism; D006160:Guanosine Triphosphate / Q000378:metabolism; D006801:Humans; D010300:Parkinson Disease / Q000473:pathology*; D011863:Radioimmunoassay
chemical_list: D001708:Biopterins; D006160:Guanosine Triphosphate; D006136:GTP Cyclohydrolase; C003402:sapropterin