1. Michael Smith Laboratories, University of British Columbia, 2185 East Mall; Vancouver British Columbia V6T 1Z4 Canada
2. Department of Microbiology and Immunology; University of Michigan Medical School, 1150 W Medical Center Drive; Ann Arbor Michigan
3. Department of Chemistry; University of British Columbia, 2036 Main Mall; Vancouver British Columbia V6T 1Z1 Canada
4. Department of Biochemistry and Molecular Biology; University of British Columbia, 2350 Health Sciences Mall; Vancouver British Columbia V6T 1Z3 Canada