Jingni Wu, Yiming Wang, Sun Tae Kim, Sang Gon Kim* and Kyu Young Kang*
* Corresponding authors: Sang Gon Kim sen600@hanmail.net - Kyu Young Kang kykang@gnu.ac.kr
BMC Biotechnology 2013, 13:4 doi:10.1186/1472-6750-13-4