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. So in a galactose, it points up, in glucose, it points downwards. So this is in fact an example of a glucose. So we go from UDP galactose to UDP glucose by the activity of UDP galactose for epimerase.