Illustration (IMAGE) UT Southwestern Medical Center Caption The experimental drug avasopasem manganese protects healthy tissue while enhancing radiation's capacity to kill cancerous tumor cells by converting superoxide to hydrogen peroxide. Credit Michael Story, Ph.D. Usage Restrictions None 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.