Aurora B in Action (IMAGE) Rockefeller University Press Caption Although XIST initiates the silencing of the chromosome, the RNA (green) is temporarily released during mitosis (left). By manipulating XIST binding in vivo, Hall et al. discover that Aurora B kinase regulates the RNA’s association with chromatin: XIST is retained on the X chromosome in mitotic cells lacking Aurora B (right). Credit Hall, L.L., et al. 2009. J. Cell Biol. doi:10.1083/jcb.200811143 Usage Restrictions Reporters may freely use these materials in news coverage, with the appropriate credit information. 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.