1. National Institute of Advanced Industrial Science and Technology (AIST), 1-8-31 Midorigaoka, Ikeda, Osaka 563-8577, Japan, Faculty of Agriculture, Kyoto University, Kitashirakawa, Kyoto 606-8502, Japan, Hyogo Prefectural Institute of Industrial Research, 3-1-12 Yukihira-cho, Suma-ku, Kobe, Hyogo 654-0037, Japan, and Genetic Engineering Laboratory, National Food Research Institute, Kannondai, Tsukuba Science City, Ibaraki 305-8642, Japan