1. Department of Biology, University of Regina, 3737 Wascana Parkway, Regina, SK S4S 0A2, Canada
2. Complex Carbohydrate Research Center, University of Georgia, 315 Riverbend Road, Athens, GA 30602, USA
3. Department of Biological Sciences, University of Calgary, 2500 University Drive NW, Calgary, AB T2N 1N4, Canada
4. Department of Microbiology and Immunology, University of Western Ontario, London, ON N6A 5C1, Canada