Richard D. Vierstra (IMAGE) Washington University in St. Louis Caption George and Charmaine Mallinckrodt Professor of Biology, Washington University in St. Louis. Credit Washington University in St. Louis Usage Restrictions For editorial purposes 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.