1. Biophysics Program, Ohio State University, Columbus, OH 43210, USA.
2. Campus Chemical Instrument Center, Ohio State University, Columbus, OH 43210, USA.
3. Genomics Research Center, Academia Sinica, Taipei 115, Taiwan.
4. Institute of Biochemical Science, National Taiwan University, Taipei 10617, Taiwan.
5. Institute of Biological Chemistry, Academia Sinica, Taipei 115, Taiwan.