1. Center for Vaccine Development and Department of Microbiology and Immunology, University of Maryland School of Medicine, Baltimore, Maryland 212011;
2. Centro de Investigaciones en Ciencias Microbiológicas, Instituto de Ciencias, Benemérita Universidad Autónoma de Puebla, Puebla, Pue., Mexico2;
3. Department of Biology, Reed College, Portland, Oregon 972023;
4. Center for Biotechnology, Northwestern University, Evanston, Illinois 602014;
5. Department of Cell Biology and Molecular Genetics, University of Maryland, College Park, Maryland 207425; and
6. Illumina Inc., San Diego, California 921216