1. Protein Engineering Network of Centres of Excellence of Canada, 2036 Main Mall, Vancouver, B.C., Canada, V6T 1ZI
2. Department of Biochemistry, University of British Columbia, Vancouver, B.C., Canada
3. Department of Chemistry, University of British Columbia, Vancouver, B.C., Canada
4. Department of Microbiology, University of British Columbia, Vancouver, B.C., Canada
5. Institute of Biological Sciences, National Research Council, Ottawa, Canada
6. Ontario Cancer Institute, Toronto, Ontario, Canada