Neural Stem Cell Clones (IMAGE) Keck School of Medicine of USC Caption Neural stem cell clones in young (green) and old (red) mouse brains. Credit Albina Ibrayeva/Bonaguidi Lab Usage Restrictions To accompany press 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.