title: Letter: Heparin (continued).
mesh_terms: D000818:Animals; D001681:Biological Assay; D002417:Cattle; D004345:Drug Industry; D006493:Heparin / Q000592:standards*; D006801:Humans; D008722:Methods; D010602:Pharmacopoeias as Topic; D014481:United States
chemical_list: D006493:Heparin