Bioinformatics Group, Institute of Computer Science, University of Freiburg, Freiburg, Germany.|Bioinformatics Group, Institute of Computer Science, University of Freiburg, Freiburg, Germany.|Bioinformatics Group, Institute of Computer Science, University of Freiburg, Freiburg, Germany.|Bioinformatics Group, Institute of Computer Science, University of Freiburg, Freiburg, Germany.|Bioinformatics Group, Institute of Computer Science, University of Freiburg, Freiburg, Germany.