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<p><a href="page.php?w=thrombin">thrombin</a> (factor IIa), an active serine protease.  The activation of thrombin is a critical reaction in the <a href="page.php?w=coagulation_cascade">coagulation cascade</a>, which functions to regulate <a href="page.php?w=hemostasis">hemostasis</a> in the body.  To produce thrombin, the prothrombinase complex cleaves two peptide bonds in prothrombin, one after Arg<sup>271</sup> and the other after Arg<sup>320</sup>.   Although it has been shown that factor Xa can activate prothrombin when unassociated with the</p><p>
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