Affiliation: | 1Department of Microbiology, University of Virginia, Charlottesville, Virginia 22901;Department of Biology, McMaster University, Hamilton, Ontario, Canada;The Animal Virus Research Institute, Pirbright, Surrey, England;4Department of Microbiology and Immunology, Albert Einstein College of Medicine, Bronx, New York 10461;The Wistar Institute, Philadelphia, Pennsylvania 19104;6Department of Botany, University of Illinois, Urbana, Illinois 61801 |