1. National Institute of Bioscience and Human-Technology, 1-1, Higashi, Tsukuba, Ibaraki 305-8566, Japan; Tsukuba Research Laboratory, Tokuyama Corp., 40 Wadai Tsukuba, Ibaraki 300-4247, Japan; and Research Laboratory of Resources Utilization, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan