Capsid (image) University of Illinois at Urbana-Champaign Caption The researchers used the supercomputer Blue Waters to determine the complete HIV capsid structure, a simulation that accounted for the interactions of 64 million atoms. Credit Klaus Schulten/Juan Perilla Usage Restrictions Image may be used only to accompany stories about the research described in this release. Credit: Klaus Schulten/Juan Perilla 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.