1. Molecular Genetics of Prokaryotes, Institute of Biology III, University of Freiburg, 79104 Freiburg, Germany
2. Bioinformatics Group, Department of Computer Science, University of Freiburg, 79110 Freiburg, Germany
3. Signalling Research Centres BIOSS and CIBSS, University of Freiburg, 79104 Freiburg, Germany
4. Genetics and Experimental Bioinformatics, Faculty of Biology, University of Freiburg, 79104 Freiburg, Germany