Blood From Stem Cells (IMAGE) University of Wisconsin-Madison Caption Two transcription factors are all that is required to make blood from pluripotent stem cells. Following introduction of the factors, stem cells form endothelium (green) which subsequenty become blood cells (red). The process mimics the way blood is formed in the embryo. Credit Courtesy of Irina Elcheva and Akhilesh Kumar, Wisconsin National Primate Research 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.