Day 4 embryoid (IMAGE) University of Cambridge Caption Day 4 embryoid showing an inner epiblast-like domain marked in green surrounded by hypoblast-like cells marked in orange and trophoblast-like cells marked in purple. Credit University of Cambridge Usage Restrictions In relation to this research only License Original 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.