Gladstone Scientist Ivana Vasic (IMAGE) Gladstone Institutes Caption Gladstone scientists—including the study's first author Ivana Vasic, seen here— show that barriers between stem cells play a crucial role in human development and offer a new potential route for fertility treatment. Credit Photo: Michael Short/Gladstone Institutes Usage Restrictions Use for non-commercial purposes only, in relation to this study 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.