1. Department of Molecular, Cellular, and Developmental Biology, Yale University, New Haven, Connecticut 06520-8104
2. Peking-Yale Joint Center of Plant Molecular Genetics and Agrobiotechnology, College of Life Sciences, Peking University, Beijing 100871, China
3. Department of Biochemistry, Fudan University, Shanghai 200433, China
4. Institute of Molecular and Cell Biology, National University of Singapore, Singapore 117609