Endosomal escape (IMAGE) University of California - San Diego Caption Illustration of flu virus-mimicking nanoparticle entering and releasing mRNA into a host cell (top). A special protein on the nanoparticle’s surface triggers it to fuse with the endosomal membrane, allowing its mRNA cargo to safely escape into the host cell (bottom). Credit Angewandte Chemie International Edition Usage Restrictions Please credit: Angewandte Chemie International Edition License Original 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.