Contracting Myotubes (VIDEO) Johns Hopkins Medicine This video is under embargo. Please login to access this video. Caption Spontaneously contracting myotubes generated from normal human induced pluripotent stem cells. Credit Courtesy Cell Press 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.