1. Then a repressor protein, that blocks the operating cells

2. Operator – a segment of DNA to which a repressor binds.

3. The lac repressor is always expressed unless a co-inducer binds to it.

4. 15 This displacement allows a strong interaction with the N terminus of the repressor B helix.

5. Proteolysis that is inhibited by hedgehog targets Cubitus interruptus protein to the nucleus and converts it to a repressor.

6. Bushman FD, Anderson JE, Harrison SC, Ptashne M : Ethylation interference and X-ray crystallography identify similar interactions between 434 repressor and operator .

7. Apoptosis can be induced either by a stimulus, such as irradiation or toxic drugs, or by removal of a repressor agent.

8. 30 The repressor also recognizes sequence-dependent distortion or flexibility of the operator phosphate backbone, conferring specificity even for inaccessible base pairs.

9. This is similar to the commonly observed phosphate-binding sites at helix termini in other proteins and, in particular, other repressor-operator complexes.

10. Acinus-S’ is a co-repressor for retinoic acid receptor (RAR)-dependent gene transcription and has been suggested to be involved in RNA processing

11. In negative inducible operons, a regulatory repressor protein is normally bound to the operator, which prevents the transcription of the genes on the operon.

12. The Arabinose can only deactivate the operon for so long until the Arabinose enzyme decreases, activating the repressor again and explain thing the gradual decrease in brightness

13. Arabinose converts the repressor form of AraC to the activator form to regulate the araBAD promoter (PubMed:2962192, PubMed:3279415).In the absence of Arabinose, AraC binds to the araO2 and araI1 half-sites in the promoter region of the araBAD operon, leading to the formation of a DNA loop that blocks access of RNA polymerase to the promoter.