1. Beijing Advanced Innovation Center for Structural Biology, Tsinghua-Peking Center for Life Sciences, Centre for Plant Biology, School of Life Sciences, Tsinghua University, 100084 Beijing, China.
2. Max Planck Institute for Plant Breeding Research, 50829 Cologne, Germany.
3. Institute of Biochemistry, University of Cologne, 50674 Cologne, Germany.
4. Cluster of Excellence in Plant Sciences (CEPLAS), 40225 Düsseldorf, Germany.