So an enzyme called aldelase catalyzes the breakdown of fructose one six bisphosphate that is produced in stage one into two different three carbon molecules, glycero, aldehyde, three phosphate and dihydroxy acetone phosphate, DHAP. Now, let's go back to a moment to stage one. So in stage one, the second step of stage one was to transform the glucose into the fructose isomer. The question is, why was that necessary? Well, the reason we transform the glucose into the fructose is so that once this step takes place in stage two, we form two molecules that each have three carbons. Because if that glucose was not transformed into fructose, and it's the fructose one, six bits phosphate, that moved on to stage two, then once this reaction took place, in that case, we would have formed one molecule with two carbons and the other molecule with four carbons.