Activation and Repression Signals (IMAGE) Stowers Institute for Medical Research Caption Activation and repression signals actively compete to regulate the amount of acetyl groups at histones near enhancers. Credit Image courtesy of the Zeitlinger Lab Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.