Now, the second thing, important thing that the enzyme actually does is it creates this pocket of space that places this molecule in close proximity with these two catalytic residues. So that speeds up the reaction. But what it also does is it prevents other reactions, competing reactions, from actually taking place. For instance, let's suppose this enzyme was not here. If the enzyme was not here, what exactly would be the pathway of this molecule right over here? Well, instead of following this pathway, another reaction that would be 100 times more likely to actually take place in the absence of this enzyme is this reaction here.