title: Tetrahydrobiopterin levels in cerebrospinal fluid of affectively ill patients.
mesh_terms: D000328:Adult; D000368:Aged; D001708:Biopterins / Q000031:analogs & derivatives / Q000134:cerebrospinal fluid*; D003866:Depressive Disorder / Q000134:cerebrospinal fluid*; D006801:Humans; D008875:Middle Aged; D011621:Pteridines / Q000134:cerebrospinal fluid*
chemical_list: D011621:Pteridines; D001708:Biopterins; C003402:sapropterin