1. Department of Research and Development, Amersham Biosciences K.K., 3-25-1 Hyakunincho, Shinjuku-ku Tokyo 169-0073, Japan, and Glycogene Function Team, Research Center for Glycoscience, National Institute of Advanced Industrial Science and Technology (AIST), Open Space Laboratory C-2, 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568, Japan