1 Bioinformatics Group, Department of Computer Science, Interdisciplinary Center for Bioinformatics, 04107, Leipzig, Germany. natasha@bioinf.uni-leipzig.de.
2 Paul Flechsig Institute for Brain Research, University of Leipzig - Medical Faculty, Leipzig, Germany.
3 Bioinformatics Group, Department of Computer Science, Interdisciplinary Center for Bioinformatics, 04107, Leipzig, Germany.
4 Max Planck Institute for Mathematics in the Science, Leipzig, Germany.
5 Institute for Theoretical Chemistry, University of Vienna, Wien, Austria.
6 Facultad de Ciencias, Universidad Nacional de Colombia, Bogotá, Colombia.