1. Laboratory of Cellular Biochemistry, Veterinary Medical Science/Animal Resource Science, University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113, Japan
2. Deparment of Veterinary Anatomy, College of Agriculture, University of Osaka Prefecture, 1-1, Gakuen-cho, Sakai-shi, Osaka 593, Japan,
3. aboratory for Glyco Cell Biology, Frontier Research Program, Institute of Physical and Chemical Research (RIKEN), 2-1, Hirosawa, Wako-shi, Saitama 351-01, Japan