1. Department of Genetics, Harvard Medical School, Boston, Massachusetts 02115, United States
2. Department of Biochemistry and Biophysics, UCSF School of Medicine, San Francisco, California 94158, United States
3. Department of Chemistry, Indiana University, Bloomington, Indiana 47405, United States
4. Centre for Bacterial Cell Biology, Institute for Cell and Molecular Biosciences, Newcastle University, Newcastle upon Tyne, NE2 4AX, United Kingdom
5. Department of Molecular Biology, Umeå University, SE-901 87, Umeå, Sweden
6. School of Life Sciences, University of Warwick, Coventry, CV4 7AL, United Kingdom
7. Department of Molecular and Cellular Biochemistry, Indiana University, Bloomington, Indiana 47405, United States
8. Department of Chemistry, Utrecht University, 3584 CH, Utrecht, Netherlands
9. Department of Microbiology, Infectious Diseases, and Immunology, Faculty of Medicine, Université de Montréal, Montréal, Canada