Affiliation: | Chunshan Guo 1,Wei Cui 1,Xue Feng 1,Jianzhou Zhao 2 and Guihua Lu 1,2 1 Beijing Kaituo DNA Biotech Research Center,Beijing 100085,China 2 Pioneer Hi-Bred International Inc.,a DuPont Company,Johnston,IA 50131,USA The Institute of Genetics and Developmental Biology,the Chinese Academy of Sciences,Beijing 100101,China. |