VALVE 1 (IMAGE) Rice University Caption Rice University researchers, from left, Varun Krishnamurthy, Matthew Sapp and Jane Grande-Allen show the customized bioreactor they used to monitor how heart valve tissues respond to oxygen starvation. They reported that aortic and mitral valves use different strategies to compensate for hypoxic conditions. Credit Jeff Fitlow/Rice University 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.