Progenitors (IMAGE) Duke University Caption RNA (yellow) moves quickly toward the uppermost layer of the brain along the path of neural stem cells (red). Duke researchers visualized this phenomenon in living cells, and found that a protein implicated in Fragile X syndrome is important to this RNA transit system. Credit Louis-Jan Pilaz, Duke University 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.