Vaccine nanoparticle (IMAGE) Stanford University Caption A schematic visualization of the ferritin nanoparticle with shortened coronavirus spike proteins, which is the basis of a SARS-CoV-2 vaccine candidate from Stanford. Credit Duo Xu Usage Restrictions Image may only be used with appropriate caption or 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.