They are not expressed. Now, what exactly happens when the glucose concentration drops? So when the glucose concentration drops, our cyclic amp or cyclic adenosine monophosphate concentration will increase. And our CA MP molecule will go on to bind to a special type of protein known as our cataboli activator protein or cap. And what the cap eventually does is it will bind to site number three. But before that actually takes place, when we have a low concentration of glucose, we're going to have a high concentration of lactose.