Xue-Cheng Zhang*, Zheng Wang, Xinyan Zhang, Mi Ha Le, Jianguo Sun, Dong Xu, Jianlin Cheng and Gary Stacey
* Corresponding author: Xue-Cheng Zhang xzhang@molbio.mgh.harvard.edu
BMC Evolutionary Biology 2012, 12:6 doi:10.1186/1471-2148-12-6