title: Tetrahydrobiopterin metabolism in depression.
mesh_terms: D000328:Adult; D000368:Aged; D001708:Biopterins / Q000031:analogs & derivatives / Q000378:metabolism*; D001921:Brain / Q000378:metabolism; D006801:Humans; D008875:Middle Aged; D019964:Mood Disorders / Q000378:metabolism*; D011621:Pteridines / Q000378:metabolism*
chemical_list: D011621:Pteridines; D001708:Biopterins; C003402:sapropterin