title: A radiochemical assay for N5-formyltetrahydrofolic acid (citrovorum factor) in serum and urine.
mesh_terms: D006801:Humans; D002955:Leucovorin / Q000032:analysis* / Q000097:blood / Q000652:urine; D008657:Metabolic Clearance Rate; D008722:Methods; D011854:Radiochemistry; D013237:Stereoisomerism
chemical_list: D002955:Leucovorin