Russell's viper venom, 1934-64.
D000818:Animals; D001778:Blood Coagulation Disorders / Q000175:diagnosis*; D004739:England; D005170:Factor X / Q000097:blood; D006467:Hemophilia A / Q000188:drug therapy*; D049673:History, 20th Century; D006801:Humans; D011517:Prothrombin Time; D012911:Snakes; D014688:Venoms / Q000627:therapeutic use*
D014688:Venoms; D005170:Factor X