26S Proteasome (IMAGE) Max-Planck-Gesellschaft Caption The "regulatory particle" (in blue) detects the proteins tagged with ubiquitin and prepares them for degradation. The "core particle" (in red) breaks the proteins down into their single components. Credit Julio Ortiz / Copyright: MPI of Biochemistry 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.