Chromatin Switching (image) University of California - San Diego Share Print E-Mail Caption Aging cells periodically switch their chromatin state. The image illustrates the "on" and "off" patterns in individual cells. Credit UC San Diego Usage Restrictions Must be used in conjunction with PNAS study on aging. Share Print E-Mail 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.