Creating mouse-human chimeric embryos (IMAGE) University at Buffalo Caption Human stem cells in a glass needle are being injected into a mouse embryo held by the pipette on the left. Credit Image by Aimee Stablewski and Dawn Barnas at the Gene Targeting and Transgenic Resource, Roswell Park Comprehensive 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.