STEM 3 (IMAGE) Rice University Caption Aryeh Warmflash, left, and Sapna Chhabra led a Rice University team that discovered embryonic stem cells begin to self-organize when they sense interacting waves of molecular signals that help them start -- and stop -- differentiating into patterns. 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.