Collage, UC San Diego School of Medicine (IMAGE) University of California - San Diego Caption Ultraviolet radiation, such as sunlight, can damage cellular DNA, leading to cancer. UC San Diego researchers have described the underlying mechanism that helps explain why such damage isn't always repaired. Credit Image collage courtesy of Dong Wang, UC San Diego Usage Restrictions Use photo credit and caption as indicated. 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.