Glycolysis consists of three different stages. And previously we focus on stage one. So we said that in stage one, that glucose molecule is initially transformed into glucose six phosphate. And what that does is it traps that glucose in a cell and begins to destabilize that glucose. It makes it more reactive. Now, the second step in stage one, one is to basically transform the glucose isomer into the fructose isomer and we form fructose six phosphate.