About the Authors
Department of Computational Biology, University of Tokyo, Kashiwa, Chiba, Japan
Database Center for Life Science, Research Organization of Information and Systems, Bunkyo-ku, Tokyo, Japan
The authors have declared that no competing interests exist.
Conceived and designed the experiments: WI. Performed the experiments: WI. Analyzed the data: WI. Contributed reagents/materials/analysis tools: WI. Wrote the paper: WI. Supervised the project: TT.