Acknowledgements
This work was supported in part by grants from National Key Scientific Projects of China (2011CB933501), the Priority Academic Program Development of Jiangsu Higher Education Institutions, Jiangsu Province's Key Provincial Talents Program, Jiangsu Province Natural Science Foundation (BK2010204), and Foundation of Jiangsu Province Health Department (H200915). SC was the principal investigator and takes primary responsibility for the paper. NP, QW, QW, SD, LW, and YX performed the laboratory work for this study. DW, CR and SC wrote the paper.
Potential conflict of interest
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