title: Heparin: the contributions of William Henry Howell.
mesh_terms: D001777:Blood Coagulation; D002309:Cardiology / Q000266:history; D005337:Fibrin / Q000502:physiology; D006493:Heparin / Q000266:history*; D049672:History, 19th Century; D049673:History, 20th Century; D008396:Maryland; D010827:Physiology / Q000266:history; D014812:Vitamin K / Q000266:history
chemical_list: D014812:Vitamin K; D005337:Fibrin; D006493:Heparin