2-Cell Stage Embryos (IMAGE) Kumamoto University Caption Embryos after the first division (cleavage) from a single female knockout mouse using ultra-superovulation. Credit Professor Naomi Nakagata Usage Restrictions This image may only be used in conjunction with the accompanying release, or stories written about the work described in the release. 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.