1. Department of Biochemistry and Molecular Biology, Oklahoma Center for Medical Glycobiology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma 73104, United States
2. Department of Chemistry, 742 Choppin Hall, Louisiana State University, Baton Rouge, Louisiana 70803, United States
3. Department of Chemistry and Complex Carbohydrate Research Center, 315 Riverbend Road, University of Georgia, Athens, Georgia 30602, United States
4. Department of Cell and Developmental Biology and Structural Biology and Biophysics Program, University of Colorado Denver, Anschutz Medical Campus, Mail Stop 8108, RC-1 South Building, L18-12120, 12801 East 17th Avenue, Aurora, Colorado 80045, United States