title: Letter: The heparin thrombin clotting-time.
mesh_terms: D001777:Blood Coagulation / Q000187:drug effects*; D001780:Blood Coagulation Tests; D003018:Clot Retraction; D006493:Heparin / Q000494:pharmacology*; D006801:Humans; D013917:Thrombin; D013927:Thrombosis / Q000175:diagnosis*
chemical_list: D006493:Heparin; D013917:Thrombin