Experimental Model of Artificial Embryo (IMAGE) Université de Genève Caption A hundred cells (pink and green) encapsulated in a hollow sphere (cyan). They form a proliferating epithelium that invaginates spontaneously. Credit @UNIGE/Aurélien Roux 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.