Know how to use "fewer" and "less"? Find out.
thrombokinase throm·bo·ki·nase (thrŏm'bō-kī'nās, -nāz)
thromboplastin throm·bo·plas·tin (thrŏm'bō-plās'tĭk)
A plasma protein present in tissues, platelets, and white blood cells necessary for the coagulation of blood and, in the presence of calcium ions, necessary for the conversion of prothrombin to thrombin. Also called factor III, platelet tissue factor, thrombokinase.