1. Centre
for Glycobiology, Department of Biochemistry, Institute of Integrative
Biology, University of Liverpool, Crown Street, Liverpool, L69 7ZB, U.K.
2. Oncology
Department, University of Oxford, Old Road Campus Research Building, Oxford, OX3 7DQ, U.K.
3. Department
of Medical Biochemistry and Cell Biology, Institute of Biomedicine,
Sahlgrenska Academy, University of Gothenburg, Box 440, 40530 Gothenburg, Sweden