So in the extrinsic path and what happens is as a result of that cut in the blood vessel, we have a glycoprotein found in the membrane of that blood vessel that is exposed. And that membrane glycoprotein, the integral glycoprotein, is known as tissue factor or TF. So all the molecules in this diagram that are purple, they're simple proteins, and in this case, this is a glycoprotein. The blue molecules are Zymogen. So basically enzymes in their inactive form, and the red molecules are the active form of enzyme. So purple molecules are proteins, they're not enzymes.