Bin Wei, Wen Dui, Dong Liu, Yan Xing, Zengqiang Yuan* and Guangju Ji*
* Corresponding authors: Zengqiang Yuan zqyuan@sun5.ibp.ac.cn - Guangju Ji gj28@ibp.ac.cn
BMC Biology 2013, 11:12 doi:10.1186/1741-7007-11-12