1. Institute of Molecular and Cellular Biosciences, University of Tokyo, 1-1-1 Yayoi, Bunkyo, Tokyo 113-0032, Japan
2. Institute for Molecular Science, National Institute of Natural Sciences, Myodaiji, Okazaki
444-8585, Japan
3. Core Research
for Evolutional Science and Technology, Japan Science and Technology Agency, 1-1-1 Yayoi, Bunkyo, Tokyo 113-0032,
Japan