It consists of our control sites. Now, the lac operon actually consists of three sites. We have our operator side, we have the promoter side and we also have another type of site known as the cap side. And we'll discuss what that means in just a moment. And to the left of our cap side of site number three we have the gene that codes for the repressor protein and we also have the promoter of our gene that codes for the repressive protein. So let's discuss once again what happens when our cell contains a high concentration of glucose.