Law PNAS Graphical Abstract (IMAGE) Salk Institute Caption This image illustrates how plants respond to DNA damage (such as gamma radiation) by turning on and off‹and regulating the levels of‹a complex network of genes (colored lines) over a 24-hour period. Credit Salk Institute 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.