Garbage Disposal (image) Washington University in St. Louis Share Print E-Mail Caption A broken protein (red) is recognized by circulating enzymes and tagged with chains of a small protein called ubiquitin. These chains are recognized by regulatory regions on top of the protesome. Once recognized, the protein is unfolded and fed down the interior of the proteosome, where it is chopped into smaller pieces that can be reused by the cell. Credit E.M.L. Usage Restrictions None Share Print E-Mail 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.