Microtubule Contractility (2 of 2) (VIDEO) University of Pennsylvania School of Medicine This video is under embargo. Please login to access this video. Caption Microtubules in a cardiomyocyte. Credit The lab of Ben Prosser, Ph.D., Perelman School of Medicine, University of Pennsylvania, Science 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.