Well, because this is the phase that generates NADPH molecules as well as those ribose five phosphate molecules. So this is what the reaction looks like. We have an input of a single one glucose six phosphate molecule or a single glucose six phosphate molecule, a single water molecule and two NADP plus molecules. And what we form is the two NADPH molecules and one ribose phi phosphate molecule. In addition, we also produce a carbon dioxide and two H plus ions. So basically this is what the cell will carry out and then it will use these molecules to help carry out other processes that we discussed just a moment ago.