But as we increase the concentration of CTP, as we produce more and more CTP and in fact, once our cells concentration of CTP is plantful, we're going to see that somewhere here. If we look at the rate of formation of this molecule, it will be much lower than in this particular case. And so what that implies is as the concentration of CTP increases, it somehow goes back to this reaction here and affects the activity of this atcase because ultimately it's the atcase that controls the rate of this reaction of the production of this intermediate and carbon oil aspartate. Now, the question is where exactly does the CTP molecule actually bind to on the atcase? Well, can the CTP bind onto the active side of this enzyme? The only way to bind onto the active side is if the CTP actually resembles has the same structure as either aspartate or carbon oil phosphate.