Factor twelve is also a sea of protease and it goes on and cleaves our factor eleven and activates factor eleven, which then goes on to activate factor nine. So this one right here, which goes on to activate factor ten. Now, let's move on to our converging final common pathway which begins in this area. So basically, as soon as the extrinsic and the intrinsic pathway activates as much ten as possible, that factor ten will go on and combine with factor five protein and that will form a dimer complex we call prothrombinase. And we'll see why. We call it Protombinase in just a moment.