1. State Key Laboratory of Plant Cell and Chromosome Engineering, Institute of Genetics and Developmental Biology Chinese Academy of Sciences Beijing 100101 China
2. University of Chinese Academy of Sciences Beijing 100049 China
3. National Genomics Data Center & CAS Key Laboratory of Genome Sciences and Information, Beijing Institute of Genomics Chinese Academy of Sciences Beijing 100101 China
4. China National Center for Bioinformation Beijing 100101 China