CXCR4 (IMAGE) University of California - San Diego Caption The newly solved structure of the CXCR4 receptor (black) in complex with a chemokine (purple surface). The background shows cell migration, a process driven by chemokines interacting with receptors on cell surfaces. Credit Katya Kadyshevskaya, USC Usage Restrictions Use credit as indicated 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.