1. Plant Science Center, RIKEN, Wako-shi, Saitama 351–0198, Japan (Y.S., S.F., N.M., M.K., Y.K., S.Y.);
2. Laboratory of Nutrition Biochemistry, National Food Research Institute, Ministry of Agriculture, Forestry, and Fisheries, 2–1–2 Kannondai, Tsukuba, Ibaraki 305–8642, Japan (M.K.);
3. Department of Chemistry, Joetsu University of Education, Joetsu-shi, Niigata 943–8512, Japan (S.T.);
4. Department of Biosciences, Teikyo University, Utsunomiya 320–8551, Japan (T.N., T.Y.); and
5. Institute of Biological Sciences, The University of Wales, Cledwyn Building, Aberystwyth, Ceredigion SY23 3DD, United Kingdom (G.J.B.)