1. Department of Biochemistry and Molecular Biology, University of Maryland School of Medicine and Institute of Marine and Environmental Technology, Baltimore, Maryland, USA
2. Current address: The Solomon H. Snyder Department of Neuroscience, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
3. Current address: Department of Biology, Istanbul University, Vezneciler, Istanbul, Turkey
4. Department of Microbiology and Immunology, University of Maryland School of Medicine, Baltimore, Maryland, USA
5. University of Maryland Greenebaum Cancer Center, Baltimore, Maryland, USA
6. Current address: GlycoMantra Inc., Baltimore, Maryland, USA