Due to length constraints on virological.org posts, we are splitting this report into two parts that should be read as a single report. This is Part 1, containing Background, Data, Methods, and Findings sections 1 through 5. See Part 2 for Findings sections 6 through 9, Concluding remarks, Acknowledgements, and References. Michael Worobey, University of Arizona, Tucson, AZ 85705, USA Karthik Gangavarapu, Department of Immunology and Microbiology, The Scripps Research Institute, La Jolla, CA, ...
