1. Advanced Technology Research Laboratories, Matsushita Electric Industrial Co., Ltd. (Panasonic), 3-4 Hikaridai, Seika-cho, Soraku-gun, Kyoto 619-0237, Japan, CREST, Japan Science and Technology Agency, 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan, Department of Protein Engineering, Cancer Institute, Japanese Foundation for Cancer Research, 3-10-6 Ariake, Koto, Tokyo 135-8550, Japan, and Materials Science, Nara Institute of Science and Technology, 8916-5 Takayama, Ikoma, Nara 630-0192, Japan