About the Authors
Department of Bioinformatics and Biochemistry, Technische Universität Braunschweig, Braunschweig, Germany
The authors have declared that no competing interests exist.
Conceived and designed the experiments: RR NB KSH DS. Performed the experiments: RR NB KSH DS. Analyzed the data: RR NB DS. Wrote the paper: RR NB KSH DS.