title: [A case of impaired dihydrobiopterin synthesis with marked diurnal fluctuation].
mesh_terms: D000328:Adult; D001708:Biopterins / Q000031:analogs & derivatives* / Q000096:biosynthesis; D002940:Circadian Rhythm; D006801:Humans; D008607:Intellectual Disability / Q000175:diagnosis; D008297:Male; D009069:Movement Disorders / Q000175:diagnosis; D010649:Phenylalanine / Q000097:blood; D010661:Phenylketonurias / Q000175:diagnosis*
chemical_list: D001708:Biopterins; D010649:Phenylalanine; C017226:7,8-dihydrobiopterin