Microtuble Contractility (1 of 2) (IMAGE) University of Pennsylvania School of Medicine Caption Microtubules in a cardiomyocyte at rest (top) and when compressed. Credit The lab of Ben Prosser, Ph.D., Perelman School of Medicine, University of Pennsylvania 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.