1. Key Laboratory of Synthetic Biology, CAS Center for Excellence in Molecular Plant Sciences, Shanghai Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, Shanghai 200032, China
2. University of Chinese Academy of Sciences, Beijing 100049, China
3. Graduate Program in Microbiology, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
4. Department of Biology, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
5. Howard Hughes Medical Institute, Massachusetts Institute of Technology, Cambridge, MA 02139, USA