1. Department of Chemistry and Center for Molecular Discovery (BU-CMD), Boston University, Boston, Massachusetts 02215, United States
2. Department of Molecular Genetics, University of Toronto, Toronto, Ontario M5G 1M1, Canada
3. Princess Margaret Cancer Centre, Toronto, Ontario M5G 1L7, Canada
4. Department of Biochemistry, UT Southwestern Medical Center, Dallas, Texas 75390-9038, United States
5. Department of Medical Biophysics, University of Toronto, Toronto, Ontario M5G 1L7, Canada
6. Departments of Pediatrics and Microbiology/Immunology, Carver College of Medicine, University of Iowa, Iowa City, Iowa 52242, United States
7. Department of Biochemistry, University of Toronto, Toronto, Ontario M5S 1A8, Canada