Structure of USP28 in complex with AZ1 (IMAGE) University of Würzburg Caption The structure of USP28 in complex with the inhibitor AZ1. All amino acids that are similar (yellow) or identical (green) to USP25 are highlighted. In particular, the region where the inhibitor binds (marked with a red arrow) is identical in both proteins. Credit Kisker/JMU Usage Restrictions / License Original 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.