Well if we keep it in the glucose, then in stage two we're going to form one molecule that has two carbons and one molecule that has four carbons and that is not symmetric. So that's why we carry out step two. Again, the entire goal in stage one is to prepare that glucose for cleavage which happens in stage two. And the enzyme that catalyzes this, well this is an isomerization reaction. We transform one isomer into another and this molecule is a glucose that contains a phosphate. And so phosphor glucose isomerate.