HIV (IMAGE) University of Maryland Caption An artist's rendition of HIV (foreground). The knobs (purple) covering the virus are sugar-protein molecules, including gp120, that shield the rest of the virus (pink). Credit National Cancer Institute 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.