X-Ray Enzyme Structure (IMAGE) Umea University Caption High resolution x-ray structure of the enzyme adenylate kinase trapped in a transient structural state by a covalent disulfide bond. Credit Magnus Wolf-Watz Usage Restrictions This illustration may be used in contexts related to this news release. 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.