So this region, shown by region number six contains the gene for the base galacticidase while these other genes are genes that code for two other proteins two other enzymes involved in the breakdown of lactose into glucose and galactose. Now, what about this section? Basically this section is the regulatory section. 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.