Day 6 embryoid (IMAGE) University of Cambridge Caption Day 6 embryoid showing epiblast marker SOX2 in green, amnion marker ISL1 in purple, and primitive streak marker brachyury in orange. On rare occasions, embryoids such as this one show these aspects of anterior-posterior or dorso-ventral patterning. 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.