And so this we begin with fructose six phosphate and then we form fructose one six bisphosphate. And so now, instead of having one, we actually have two of these phosphate groups. And so just like this step actually requires ATP, this step also requires ATP. And so we see that stage one actually uses up two ATP molecules and no ATP molecules have been actually formed so far. Now, another important thing about this step, step three of stage one is once the step actually takes place, that commits that sugar molecule to undergoing the glycolysis process. Because before this step actually took place, that sugar molecule can be stored in the form we call glycogen.