Stem cell embryo model (IMAGE) University of Exeter Caption Left is stem cell embryo model; right is nature human embryo Credit University of Exeter Usage Restrictions Only to be used in relation with story on University of Exeter press release dd May 5 2021 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.