title: The effect of age on tetrahydrobiopterin metabolism in the human brain.
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000375:Aging / Q000378:metabolism*; D001708:Biopterins / Q000031:analogs & derivatives* / Q000378:metabolism; D005625:Frontal Lobe / Q000378:metabolism*; D006801:Humans; D008875:Middle Aged; D013702:Temporal Lobe / Q000378:metabolism*
chemical_list: D001708:Biopterins; C003402:sapropterin