1. Department of Cell Biology, National Institute for Basic Biology, Nishigonaka 38, Myodaiji-cho, Okazaki 444–8585 Japan (H. Hanaoka, T.N., Y.O.);
2. Department of Molecular Biomechanics, School of Life Science, The Graduate University for Advanced Studies, Okazaki 444–8585, Japan (H. Hanaoka, T.N., Y.O.);
3. Mitsui Plant Biotechnology Research Institute (disbanded in March 1999), Tsukuba, Ibaraki 305–0047, Japan (Y.S., D.S.);
4. Kazusa DNA Research Institute, Yana 1532–3, Kisarazu, Chiba 292–0812, Japan (T.K., S.T.); and
5. Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1–1–1 Yayoi, Bunkyo-ku, Tokyo 113–8657, Japan (H. Hayashi)