Well, the repressive protein is what this Operon actually uses to turn off the expression of these genes. So notice upstream. So to this side of the promoter we have this red gene known as the repressor gene. And this repressor gene is also part of this opera. That repressor gene basically codes for an inactive so, not an active repressor protein. And to activate that inactive repressor protein so that it can bind onto the operator segment, a special thing must happen.