Overview Function can turn transcription on/off can ↑ or ↓ rate of transcription can act in cis or trans login to view 6 more bullets Mechanisms of control modify RNAp binding stability login to view 15 more bullets modify RNAp accessibility to DNA login to view 17 more bullets Embryonic gene regulation sonic hedgehog (SHH) gene login to view 2 more bullets homeobox (HOX) genes login to view 1 more bullet paired box (PAX) genes login to view 9 more bullets Examples of gene regulation peroxisome proliferator-activated receptors (PPARs) login to view 9 more bullets