Donna Zhang, University of Arizona (image) University of Arizona Caption Zhang's research group studies the molecular mechanisms cells use to protect themselves from damage caused by toxicants and carcinogens. Credit Daniel Stolte/ University of Arizona News Usage Restrictions This visual may only be used in conjunction with reporting/ posting of this news release. Image/ video credit must be included exactly as indicated. 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.