So the red one is the active form of factor ten. So everything shown in blue is an enzyme, but it exists in a zymogen, inactive form. The red molecules are those enzymes in their fully active form. So blue means inactive zymogen and red means fully active. And so once these two interact, they go on to activate this one into its fully functional and active factor ten. Now, once we form factor X, factor ten basically combines and interacts with another protein called factor five.