Diagram of Virus Invading Host Cell (IMAGE) Purdue University Caption This diagram depicts how the changing arrangement of proteins in a key structure enables viruses to invade and fuse with host cells. Credit Purdue University Department of Biological Sciences image/Long Li Usage Restrictions None 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.