It will take this molecule here to basically form the first base. Then it will move on onto the second base, which is a T, and that will basically form an A. Now, we have two types of A's that we can use. One of them is the normal deoxy adenosine triphosphate. The other one is a dioxy adenosine triphosphate. And the dioxia adenosine triphosphate does not contain a hydroxyl group on the third prime carbon.