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. And so instead of forming this final product, this molecule will be 100 times more likely to go on and form this molecule here. That's why it's so important that this enzyme is actually here, because in the absence of this enzyme, this DHAP, would go on to form the nodiol intermediate, but then the nodiol intermediate would be 100 times more likely to go on and form this product, which we actually don't want to form. And so what this enzyme does is it basically stops these competing reactions from actually taking place.