<prompt> The anticoagulant normally present in animal cell is:Vitamin K.Heparin.Hyaluronidase.Dicoumarol.  <response>: Harper 603Heparin is used in clinical medicine to inhibit coagulation because it binds to the specific cationic site of antithrombin III, inducing a conformational change and promoting its binding to thrombin as well as to its other substrates. 