[1] Hannover Med Sch, Zentrum Biochem, D-30625 Hannover, Germany
[2] Natl Inst Adv Ind Sci & Technol, Res Ctr Glycosci, Tsukuba, Ibaraki 3058566, Japan
[3] SUNY Stony Brook, Inst Cell & Dev Biol, Dept Biochem & Cell Biol, Stony Brook, NY 11794 USA
[4] Univ Calif San Diego, Dept Cellular & Mol Med, La Jolla, CA 92093 USA