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. But unlike CTP, when ATP binds onto these regulatory chains, it actually increases the rate of activity of this enzyme and increases the rate of activity of the enzyme by displacing the CTP molecule from that regulatory chain and shifting the entire curve from the T state to that R state. So Adamosine triphostate, or ATP, is also now a steric effector of atcase. It binds to the same side on the regulatory chain, but it actually increases the activity of that ATCA.