1. Department of Molecular Biology, Max Planck Institute for Biophysical Chemistry, Am Faßberg 11, 37077 Göttingen, Germany.
2. Gene Center Munich, Ludwig-Maximilians-Universität München, Feodor-Lynen-Straße 25, 81377 Munich, Germany.
3. Department of Biosciences and Nutrition, Center for Innovative Medicine, and Science for Life Laboratory, Karolinska Institutet, Novum, Hälsovägen 7, 141 83 Huddinge, Sweden.
4. Department of Biology, University of Cologne, Zülpicher Straße 47, 50647 Cologne, Germany.
5. Max Planck Institute for Plant Breeding Research, Carl-von-Linné Weg 10, 50829 Cologne, Germany.