Muscle Flashes (VIDEO) Duke University This video is under embargo. Please login to access this video. To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Caption Lab-grown muscle was genetically engineered to flash with the calcium spikes that accompany muscle contraction. After being implanted into a mouse, the brightness and regularity of the flashes indicated how well the muscle was healing. The addition of macrophages (bottom row) to the engineered muscle resulted in greater functional recovery after 15 days. Credit Mark Juhas, 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.