Our experimental procedures complied with current Chinese laws
on animal welfare and research. This work was supported by grants
from the National Natural Science Foundation of China (30770310,
30970435 and 31270443), the Lishui Department of Science and
Technology (20110426) and the Open Project of Laboratory of Lishui
University. We thank Yue Qiu, Lai-Gao Luo, Ce Chen, Yi-Jun Gao and
Dan-Feng Qi and for their help during the research.