^aDepartment of Theoretical Chemistry, University of Vienna, Währingerstraße 17, A-1090 Wien, Austria

^bZentralfriedhof Wien, 3. Tor, Simmeringer Haupstraße 234, A-1110 Wien, Austria

^cBioinformatics Group, Department of Computer Science, University of Leipzig, Härtelstraße 16-18, D-04107 Leipzig, Germany

^dInterdisciplinary Center for Bioinformatics, University of Leipzig, Härtelstraße 16-18, D-04107 Leipzig, Germany

^eDepartment of Biotechnology and Bioinformatics, University of Applied Sciences, Weihenstephan, D-85350 Freising, Germany

^fMax Planck Institute for Mathematics in the Sciences, Inselstrasse 22-26, D-04103 Leipzig, Germany

^gSanta Fe Institute, 1399 Hyde Park Rd., Santa Fe, NM 87501, USA