And ultimately what we want to do in this pathway is transform a fructose molecule into dihydroxy acetone phosphate and glycerol aldehyde three phosphate because these are the two molecules that are in fact glycolytic metabolites. And so we can feed them directly into the glycolytic pathway and then we can use those molecules to form ATP molecules. So let's see what these three steps actually are. So in step one of the fructose one phosphate pathway, we have an enzyme we call fructokinase. So what is fructokinase? What does it do?