IMAGE (IMAGE) Nara Institute of Science and Technology Caption <i>Arabidopsis</i> root tips treated with DNA-damaging agents. Green color indicates cytokinin (left) and auxin (right) signals that increase and decrease, respectively, in response to DNA damage. Credit Masaaki Umeda Usage Restrictions Credit required. 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.