1. Centre for Biologics Research, Biologics and Genetic Therapies Directorate, Health Canada, Ottawa, Ontario K1A 0K9, Canada, Banting and Best Department of Medical Research, and Structural Genomics Consortium, University of Toronto, Toronto, Ontario M5G 1L6, Canada, Department of Chemistry and Department of Physics and Astronomy, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada, and Department of Biochemistry, Queen’s University, Kingston, Ontario K7L 3N6, Canada