Composite (IMAGE) University of Nottingham Caption Cross-section of a bioprinted tubular structure with endothelial cells (green) on and embedded within the wall. Credit Professor Alvaro Mata 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.