Now, to see what this mechanism actually involves, let's take a look at the following hypothetical series of enzymatic reaction. So let's suppose we want to convert A into D. And the way that we basically convert A into D is by following these series of steps. So enzyme one takes our molecule A and transforms it into intermediate B. Then enzyme two takes B, transforms it into intermediate C and enzyme three then takes C and transforms it into our product D. Now, in this process of feedback mechanism, we basically have one of these intermediates or products moves back and binds to the allosteric sites of one of these enzymes. And that either inhibits or activates the activity of that enzyme. And depending on whether we have inhibition or activation, we have these two types of feedback mechanism processes.