And the way that we reform the UDP glucose is by taking this molecule, the UDP galactose, which looks like this. So in step two, we form this molecule, right, this molecule here, which is the UDP galactose. And now what we do to this molecule is we use a special enzyme that flips this hydroxyl group from the up position to the down position. And if we flip this hydroxyl from the up to this down, what we're going to form is a glucose. And so we go from UDP galactose to UDP glucose. Because remember, as I mentioned a moment ago, the only difference between galactose and glucose is the orientation of this hydroxyl group.