Exosomes (1 of 2) (IMAGE) Johannes Gutenberg Universitaet Mainz Caption Exosomes (red arrow) are small vesicles that contain proteins and nucleic acids. They are commonly present in close proximity to nerve cell axons where they are ideally positioned to supply protective substances. Credit ill./©: Institute of Molecular Cell Biology, JGU Usage Restrictions This image is to be used only in connection with the JGU press release 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.