Mu-opiod Receptor (IMAGE) Carnegie Mellon University Caption After treatment with DAMGO, an endogenous mu-opiod receptor is internalized in endosomes (left) and after DAMGO washout is recycled back to the cell surface (right). Credit Carnegie Mellon 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.