Poss Blue Heart (IMAGE) Duke University Caption Post-mortem examination of a mouse heart shows a clear delineation where TREE gene enhancers sensed injured tissue and began expression of a gene for blue stain. The enhancer senses injury, orchestrates gene expression, and then stops repairs. Infusion of the enhancer can be effective before or even after a heart attack. Credit Ken Poss Lab, Duke University Usage Restrictions Must credit Ken Poss Lab, Duke University License Original 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.