1. Department of Cellular and Molecular
Medicine, Glycobiology Research and Training Center, University of California, San Diego, La Jolla, California
92093, United States
2. Laboratory
of Structural Biology,
National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park,
North Carolina 27709, United States
3. Ludwig Institute for Cancer Research
and Department of Cellular and Molecular Medicine, University of California, San Diego, La Jolla, California 92093,
United States
4. Departments
of Biochemistry
and Chemistry, Center for Structural Biology, Vanderbilt University, Nashville, Tennessee 37232, United States