1. Centre for Blood Research and Department of Pathology and Laboratory Medicine, University of British Columbia, Vancouver, British Columbia V6T 1Z3, Canada.
2. Department of Biochemistry, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA.
3. Michael Smith Laboratories, Department of Chemical and Biological Engineering, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada.
4. Department of Urologic Sciences, University of British Columbia, Vancouver, British Columbia V5Z 1M9, Canada.
5. Department of Chemistry, University of British Columbia, Vancouver, British Columbia V6T 1Z3, Canada.