1. Department of Biotechnology, Tokyo University of Agriculture and Technology, Koganei, Tokyo 184-8588, Japan, Department of Applied Chemistry, National Defense Academy, Yokosuka, Kanagawa 239-8686, Japan, Laboratory of Entomology, Tokyo University of Agriculture, Setagaya, Tokyo 156-8502, Japan, Material Analysis Research Laboratories, Teijin Ltd., Hino, Tokyo 191-8512, Japan, and Oxford Biomaterials Ltd., Units 14-15 Galaxy House, Thatcham RG19 6HR, U.K.