HIV Capsid Protein Building Blocks (IMAGE) University of Missouri-Columbia Caption The protein building block of HIV capsid (top left) can assemble to form a hexamer (top middle). Crystals grown using this building block (bottom left and middle) contain an array or lattice of hexamers (right). Credit Karen Kirby and Anna Gres, Bond Life Sciences Center 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.