European Molecular Biology Laboratory, Genome Biology Unit, 69117 Heidelberg, Germany, Department of Bioinformatics and Computational Biology, Genentech Inc., South San Francisco, CA 94080, USA and.|European Molecular Biology Laboratory, Genome Biology Unit, 69117 Heidelberg, Germany, Computational Genome Biology, German Cancer Research Center, 69120 Heidelberg, Germany.|Department of Bioinformatics and Computational Biology, Genentech Inc., South San Francisco, CA 94080, USA and.|European Molecular Biology Laboratory, Genome Biology Unit, 69117 Heidelberg, Germany.