Cover photograph (Copyright © 2005, American Society for Microbiology. All Rights Reserved.): Pseudoatomic model of infectious bursal disease virus subviral particles obtained by fitting the X-ray atomic structure of VP2 into a 3-D electron cryomicroscopy reconstruction. The particles are dodecahedrons, formed by 20 trimers. Secondary structures are visualized in ribbon representation. The C terminus of VP2 forms the helices located near the 5-fold axes. Due to steric hindrance, the formation of these symmetry axes requires the proteolytic maturation of the precursor of VP2. (See related article on page 12253.)