By fructokinase that destabilizes our fructose also traps that fructose in a cell. And now we can basically cleave that fructose by the activity of an enzyme we call fructose one phosphate. Aldolase. Now, what is an aldolase? Well, an aldelase is an enzyme that catalyzes an aldol cleavage. So essentially we have the fructose one phosphate that we form in step one.