1. Department of Protein Engineering, Cancer Institute, Toshima, Tokyo 170-8455, Japan, SORST/JST, c/o NEC, 34 Miyukigaoka, Tsukuba, Ibaraki 305-8501, Japan, NEC, 34 Miyukigaoka, Tsukuba, Ibaraki 305-8501, Japan, AIST, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan, Department of Material Science and Engineering, Meijo University, 1-501 Shiogamaguchi, Tenpaku, Nagoya 468-8502, Japan, and CREST/JST, c/o Cancer Institute, Toshima, Tokyo 170-8455, Japan