Spike Protein (IMAGE) DOE/Oak Ridge National Laboratory Caption Snapshots of the “closed,” “up,” and “open” states for the SARS-CoV-2 Delta spike protein. Credit #COVIDisAirborne Team Usage Restrictions N/A 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.