Blastocyst morphology (IMAGE) Toho University Caption A fully re-expanded blastocyst (left) and a shrunken blastocyst with insufficient re-expansion (right). Credit Ayumu Ito Usage Restrictions None 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.