So we create this negatively charged group on the glucose and then destabilizes our molecule and that will help us break down the molecule in stage two. So step two of stage one involves transforming the six membered sugar glucose into the five membered isomer, the fructose. So we use an enzyme known as phosphorlucose isomerase and we basically transform glucose six phosphate into fructose six phosphate. So step two does not require energy. And in step three, we take the fructose six phosphate and we use an enzyme known as phosphor fructose kinase. We use an ATP molecule and transfer a second phosphate group onto that fructose.