Now, the TF seven complex has two different proteins that it readily activates. We have protein factor nine and protein factor ten. And notice that protein factor nine when it's activated, it goes on to activate some more of ten. And this is an amplification process. It's a process by which we amplify the amount of ten that is formed because ultimately it's this ten that will go on to form blood clots as we'll see in just a moment. So once again the extrinsic pathway consists of these steps and it's a quick acting pathway.