1. Department of Physics, KAIST, Daejeon 305-701, South Korea.
2. Department of Genetic Engineering, Sungkyunkwan University, Suwon, Gyeonggi-do 4400-746, South Korea.
3. Department of Biochemistry, Biophysics, and Molecular Biology, Iowa State University, 4152 Molecular Biology Building, Ames, IA 50011, USA.
4. School of Computational Sciences, Korea Institute for Advanced Study, Seoul 130-722, South Korea.
5. Division of Integrative Biosciences and Biotechnology, POSTECH, Pohang 790-784, South Korea.
6. Institute for the BioCentury, KAIST, Daejeon 305-701, South Korea.