We form the ATP and the H plus. Now, what this does is, again, it traps it inside the cell and destabilizes it in the next step. Step number two, we have an enzyme known as galactose one phosphate because this is a substrate that it acts on and it's a urinal transferase. And what a transferase does is it basically transfers some type of group from one molecule onto a different molecule. Now, aside from having the galactose one phosphate, another molecule known as UDP glucose actually comes in. So this is a modified glucose molecule that contains a uridine diphosphate.