Copper, Zinc Superoxide Dismutase (IMAGE) Oregon State University Caption Copper, zinc superoxide dismutase is essential to life, but when damaged can become toxic. Credit (Photo courtesy of Oregon State University) 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.