CONSTRAST 1 (IMAGE) Rice University Caption An improved compound of bismuth and carbon nanotubes called Bi4C@US-tubes, developed at Rice University, CHI St. Luke's Health-Baylor St. Luke's Medical Center and Baylor College of Medicine, could enhance the ability to track stem cells as they move through the body and target diseases. Credit Wilson Research Group/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.