1. Peking-Yale Joint Center for Plant Molecular Genetics and Agro-biotechnology, National Laboratory of Protein Engineering and Plant Genetic Engineering, College of Life Sciences, Peking University, Beijing 100871, China
2. Department of Molecular, Cellular, and Developmental Biology, Yale University, New Haven, Connecticut 06520-8104
3. National Institute of Biological Sciences, Beijing 102206, China
4. College of Life Sciences, Beijing Normal University, Beijing, 100875, China
5. Department of Biology, Wilkes University, Wilkes-Barre, Pennsylvania 18766