La Jolla Institute for Allergy and Immunology, La Jolla, California, United States of America.|Department of Plant and Microbial Biology, University of California, Berkeley, California, United States of America.|Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada.|Department of Computer Science and Genetics, Tufts University, Medford, Massachusetts, United States of America.|Department of Biological Sciences, University of Maryland, College Park, Maryland, United States of America.