It's known as our operator region. And once the repressive protein binds to the operator region by using electric forces once it binds it basically will block the process of transcription of these genes here. So once formed, the repressive protein binds the operator region and blocks the RNA polymerase from transcribing, the mRNA molecule that codes for the beta Galacticase, as well as these other two types of genes. Now, why exactly does the cell need to block the transcription of these mRNA molecules that code for the proteins that break down lactose? So this is because inside the cell, we have a high concentration of glucose. So we do not actually have to break down lactose because we have the glucose that we can use as our energy source.