title: Letter: Inhibition of thrombotic effect of factor IX.
mesh_terms: D000818:Animals; D005164:Factor IX / Q000037:antagonists & inhibitors*; D006493:Heparin / Q000494:pharmacology; D011817:Rabbits; D013927:Thrombosis / Q000517:prevention & control*
chemical_list: D005164:Factor IX; D006493:Heparin