Microfabricated Tissue Gauges to Measure and Manipulate Forces from 3-D Microtissues (video) University of Pennsylvania Share Print E-Mail Loading video... Caption This video shows time lapse photography of a cell and collagen mix as it retracts and forms tissue. Credit Image courtesy of Wesley R. Legant, the University of Pennsylvania. Usage Restrictions None Share Print E-Mail 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.