1. Biology and Medicine Key Laboratory of Shaanxi Province, Northwest University, Xi'an 710069, People's Republic of China
2. CNRS-UMR 8642, Departement de Chimie, Ecole Normale Superieure, 24 rue Lhomond, 75231 Paris Cedex 05, France
3. Molecular Microbiology Laboratory, Northwest University, Xi'an 710069, People's Republic of China
4. Chengdu University of Traditional Chinese Medicine, Chengdu 610075, People's Republic of China