1. Department
of Biochemistry, University of Vermont, College of Medicine, 89 Beaumont Avenue, Burlington, Vermont 05405, United States
2. Department of Chemistry, Parsons
Hall, University of New Hampshire, Durham,
New
Hampshire 03824, United States
3. Department of Biochemistry and Molecular Biology and Centre for Blood
Research, University of British Columbia, Vancouver, BC V6T 1Z3, Canada