Human Engineered Muscle (VIDEO) Duke University This video is under embargo. Please login to access this video. Caption Duke engineers have engineered the first ever contracting lab-grown human muscles. This video shows forceful contraction of the human muscle bundles in response to electrical stimulation followed by a genetically encoded calcium sensor being used to visualize calcium flows during electrical stimulation. 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.