So the entire goal of the extrinsic pathway and the intrinsic pathway is to basically amplify and activate this protein X, protein Ten. And the enzyme Ten basically combines with five to go on and form Thrombin from the Xymogen form prothrombin. Now Thrombin is actually a serine protease and it will activate this fibrinogen molecule pro Eelytically. And what it does is it cleaves at four different locations. So what are these four locations? So right here, right here, right here and right here and this is shown in the following diagram.