Nup153 and Sox2 Interact (IMAGE) Salk Institute Caption Salk scientists find that interaction between two key proteins regulates development of neurons. A fluorescent microscopy image shows Nup153 (red) in pore complexes encircling and associating with Sox2 (green) in a precursor cell nucleus. Credit Salk Institute/Waitt Center Usage Restrictions with credit and related coverage. 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.