So recall from the previous lecture that when galactose is uptaken by the cells, the galactose must be transformed into glucose six phosphate before it can actually begin to break down into ATP molecules. And the conversion of galactose into glucose phosphate is known as Galactose glucose interconversion pathway. And within this pathway. We have four different steps that are catalyzed by four different enzymes. And one of these steps, step number two, is catalyzed by galactose one phosphate, urinal transferase. So what this enzyme does on the normal conditions is it takes galactose one phosphate in the presence of UDP glucose.