1. Center for Computational and Theoretical Biology, University of Würzburg, Hubland Nord, Würzburg 97074, Germany
2. Department of Bioinformatics, University of Würzburg, Biocenter, Am Hubland, Würzburg 97074, Germany
3. Department of Biology, Systematic Botany, Justus-Liebig-University Giessen, Giessen 35392, Germany