Signal Receptor-Containing Vesicles (IMAGE) Forschungsverbund Berlin Caption Signal receptor-containing vesicles (red) form on the inside of the cell membrane (brown) and bud off into the cell. The magnifying glass shows molecular details of the active lipid kinase PI3KC2A. Credit Thomas Splettstoesser Usage Restrictions The image may only be used with appropriate caption and credit. 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.