GPCR and E3 ligase, UC San Diego Health (IMAGE) University of California - San Diego Caption Endothelial cells stained with antibodies to track the GPCR (shown in green) and E3 ligase (shown in red) and detected by immunofluorescence confocal microscopy. Credit UC San Diego Health Usage Restrictions Use caption and photo 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.