Center for Bioinformatics, National Laboratory of Plant Genetic Engineering and Protein Engineering and College of Life Sciences, Peking University, Beijing, PR China.|Center for Bioinformatics, National Laboratory of Plant Genetic Engineering and Protein Engineering and College of Life Sciences, Peking University, Beijing, PR China.|Center for Bioinformatics, National Laboratory of Plant Genetic Engineering and Protein Engineering and College of Life Sciences, Peking University, Beijing, PR China.|Center for Bioinformatics, National Laboratory of Plant Genetic Engineering and Protein Engineering and College of Life Sciences, Peking University, Beijing, PR China.|Center for Bioinformatics, National Laboratory of Plant Genetic Engineering and Protein Engineering and College of Life Sciences, Peking University, Beijing, PR China.