1. Imaging Sciences Laboratory, Division of Computational Bioscience, Center for Information Technology
2. Laboratory of Structural Biology Research, National Institute of Arthritis and Musculoskeletal and Skin Diseases, National Institutes of Health, Bethesda, Maryland
3. Department of Microbiology and Cancer Center, University of Virginia Health System, Charlottesville, Virginia
4. Department of Molecular Genetics and Biochemistry, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania