And so what that means is when CTP actually binds onto the regulatory chains, these CTP molecules make it more difficult for the substrate to actually bind onto the active sides and transform this coronary structure from the T state into the R state. And so in this manner, our cells use these CTP molecules to actually regulate the behavior of this enzyme. So when we have a high concentration of CTP, we don't want to produce any more CTP. And so the cell uses the CTP in a negative feedback loop to basically inhibit the activity of this enzyme. Now, the second type of allosteric effector of this enzyme is actually ATP adenosine triphosphate. In fact, adenosine triphosphate, just like CTP, also binds onto that same regulatory chain, these red chains.