This study was performed by Qingfeng Zhang, Ze-Xian Liu Ph. D., Hui Chen Ph. D., Miao Xu Ph. D. and Weiwei Zhai Ph. D.

Qingfeng Zhang, Ze-Xian Liu Ph. D. and Miao Xu Ph. D. are from

Sun Yat-sen University Cancer Center,

Building 2#, 651 Dongfeng East Road,

Guangzhou 510060, P. R. China

Hui Chen Ph. D. and Weiwei Zhai Ph. D. are from

Key Laboratory of Zoological Systematics and Evolution,

Institute of Zoology, Chinese Academy of Sciences, Beijing, China

Email: liuzx AT sysucc.org.cn

Tel/Fax: +86-20-87342025