Antonio Jimeno, MD, PhD (IMAGE) University of Colorado Anschutz Medical Campus Caption Antonio Jimeno, MD, PhD and colleagues show that two kinds of stem cells are better than one when transplanting human immune system into mice. Credit University of Colorado Cancer Center 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.