1. Department of Biological Information, Tokyo Institute of Technology, Tokyo 152-8550, Japan
2. Biobyte solutions GmbH, Bothestr 142, 69126 Heidelberg, Germany
3. European Molecular Biology Laboratory, Meyerhofstrasse 1, 69117 Heidelberg, Germany
4. Molecular Medicine Partnership Unit, University of Heidelberg and European Molecular Biology Laboratory, 69120 Heidelberg, Germany
5. Max-Delbrück Center for Molecular Medicine in the Helmholtz Association, 13125 Berlin, Germany
6. Department of Bioinformatics, Biocenter, University of Würzburg, 97074 Würzburg, Germany