1. Department of Chemical and Biological EngineeringPrinceton University 207 Hoyt Laboratory Princeton NJ 08544 USA
2. Department of ChemistryPrinceton University 207 Hoyt Laboratory Princeton NJ 08544 USA
3. Laboratory of Molecular Biophysics andTri-Institutional Training Program in Chemical BiologyRockefeller University 1230 York Ave. New York NY 10065 USA
4. Center for Health SecurityJohns Hopkins Bloomberg School of Public Health 621 E. Pratt St. Suite 210 Baltimore MD 21202 USA
5. Center for Emerging Pathogens, Division of Infectious DiseaseNew Jersey Medical SchoolRutgers Biomedical and Health Sciences University 185 South Orange Ave. Newark NJ 07103 USA
6. Department of Molecular BiologyPrinceton University 207 Hoyt Laboratory Princeton NJ 08544 USA