Ischemia (VIDEO) Duke University This video is under embargo. Please login to access this video. Caption After heart attacks or the progression of heart disease, scarred patches of heart tissue are often unable to transmit electrical signals (red), straining the surrounding tissue, as seen on the left. On the right, a formerly inactive patch of heart tissue has had its conductivity restored by insertion of a trio of bacterial genes. Credit Nenad Bursac, Duke University 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.