<p><strong>Noun:</strong></p><ul><li>Biochemistry</li><li>lipoprotein</li></ul><p><strong>Definition:</strong></p><ul><li>A lipoprotein in the blood that converts prothrombin to thrombin</li></ul><p><strong>Pharmacology:</strong></p><ul><li>A commercial form of this substance, obtained from the brains of cattle</li><li>Used chiefly as a local hemostatic</li><li>Used as a laboratory reagent in blood prothrombin tests</li></ul>