1. Institute of Bioinformatics and Structural Biology, National Tsing Hua University, Hsinchu 300, Taiwan
2. Fischell Department of Bioengineering, University of Maryland, College Park, MD 20742, USA
3. Institute of Biological Chemistry, Academia Sinica, Taipei 115, Taiwan
4. Health Services and Health Administration, University of Southern Indiana, Evansville, IN 47712, USA
5. SPring-8/JASRI, Hyogo 679-5198, Japan