1. Antimicrobial Discovery Center, Department of Biology, Northeastern University, 134 Mugar Hall, 360 Huntington Ave 02115, Boston, MA, USA
2. Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School 02115, Boston, MA, USA
3. Department of Microbiology, the Forsyth Institute, Cambridge, MA, USA
4. Department of Oral Medicine, Infection and Immunity, Harvard School of Dental Medicine, Boston, MA, USA