Michihisa Umetani, University of Houston (IMAGE) University of Houston Caption University of Houston biologist Michihisa Umetani discovered that the nuclear receptor LXR protects the cardiovascular system by activating another family member, the estrogen receptor. Credit University of Houston 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.