1. Department of Biochemistry, Molecular Biology, and Biophysics and The Biotechnology Institute, University of Minnesota, 1479 Gortner Avenue, St. Paul, Minnesota 55108
2. Department of Chemistry, McGill University, 801 Sherbrooke Street West, Montréal, Québec H3A 2K6, Canada
3. Biotechnology Research Institute, National Research Council of Canada, 6100 Royalmount Avenue, Montréal, Québec H4P 2R2, Canada