Mouse Embryo (IMAGE) Center for Genomic Regulation Caption Mouse embryo day E4.5 before being implanted into the mother's uterus. Credit © CRG 2019. All rights reserved. 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.