1. Institute for Molecular Virology and McArdle Laboratory for Cancer Research, University of Wisconsin-Madison, Madison, WI 53706
2. Department of Microbiology and Immunology, Medical College of Wisconsin, Milwaukee, WI 53226
3. John and Jeanne Rowe Center for Research in Virology, Morgridge Institute for Research, Madison, WI 53715
4. Cellular Biology Program and Department of Biomedical Sciences, Ohio University Heritage College of Osteopathic Medicine, Athens, OH 45701