Diffusion Barrier (IMAGE) University of Zurich Caption Dividing neural stem cells establish a diffusion barrier. It participates in the asymmetric segregation of aging factors such as ubiquitinated, damaged proteins (red) during cell division (DNA blue). The barrier ensures proper neural stem cell proliferation. Credit UZH 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.