1. SORST/JST, c/o NEC, 34 Miyukigaoka, Tsukuba, Ibaraki 305-8501, Japan, Department of Protein Engineering, Cancer Institute, Koto, Tokyo 135-8550, Japan, NEC, 34 Miyukigaoka, Tsukuba, Ibaraki 305-8501, Japan, Meijo University, 1-501 Shiogamaguchi, Tenpaku, Nagoya 468-8502, Japan, and CREST/JST, c/o Cancer Institute, Koto, Tokyo 135-8550, Japan