HIV with Envelope Protein Trimers (image) La Jolla Institute for Allergy and Immunology Share Print E-Mail Caption The vaccine candidates used in the study mimic the trimeric envelope protein spikes on the surface of HIV. Rendering of HIV with envelope protein trimers clearly visible on the virus surface. Credit Courtesy of La Jolla Institute for Allergy and Immunology. Usage Restrictions None Share Print E-Mail 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.