1. State Key Laboratory of Microbial Metabolism, Joint International Research Laboratory of Metabolic and Developmental Sciences, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai, China;
2. Beijing Advanced Innovation Center for Structural Biology, Tsinghua-Peking Joint Center for Life Sciences, Center for Plant Biology, School of Life Sciences, Tsinghua University, Beijing, China;
3. Institute of Biochemistry, University of Cologne, Cologne, Germany
4. Department of Plant-Microbe Interactions, Max-Planck Institute for Plant Breeding Research, Cologne, Germany