So let's take a look at the following diagram and see what's taking place. So we have this enzyme which is our phosphate fructokinase. And these blue molecules are the fructose six phosphate. Now when the concentration of fructose six phosphate is very high, what happens is fructose six phosphate transforms into the purple molecule known as fructose two six biphosphate and fructose two six by phosphate the purple molecule binds to the allosteric site of this enzyme, the phosphorptokinase and that activates the activity of that enzyme. So now the phosphor fructosekinase can take the glucose six phosphate shown in blue and it can transform that molecule into the final product in this particular reaction known as our fructose one six by phosphate. So we see that in this process when the intermediate goes back and binds to our enzyme, it actually activates that enzyme and this phenomenon is known as positive feedback.