Lead author Shawn Pua Eiko Nishi (IMAGE) University of Texas Medical Branch at Galveston Caption Lead author Shawn Pua Eiko Nishi Credit The University of Texas Medical Branch at Galveston 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.