1. Laboratory of Molecular Developmental Biology, State Key Laboratory of Membrane Biology, School of Life Sciences, Tsinghua University, Beijing 100084, China.
2. Tsinghua-Peking Center for Life Sciences, Tsinghua University, Beijing 100084, China.
3. The Center for Plant Biology, School of Life Sciences, Tsinghua University, Beijing 100084, China.
4. Guangzhou Laboratory, Guangzhou 510320, Guangdong Province, China.