1. Laboratory of Molecular Biology, Wageningen University, Wageningen 6708PB, The Netherlands
2. Institute for Biochemistry and Biology, Potsdam University, Potsdam 14476, Germany
3. Computational Molecular Biology, Max Planck Institute for Molecular Genetics, Berlin 14195, Germany
4. Bioscience, Wageningen Plant Research, Wageningen 6708PB, The Netherlands