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Additional Information

Competing Interests

The authors declare they have no competing interests.

Author Contributions

Yun Liu conceived and designed the experiments, performed the experiments, analyzed the data, contributed reagents/materials/analysis tools, wrote the paper.

Tao Hou performed the experiments, contributed reagents/materials/analysis tools, prepared figures and/or tables.

Liu Fu conceived and designed the experiments, analyzed the data, prepared figures and/or tables, reviewed drafts of the paper.

Funding

This work has been supported by National Natural Science Foundation of China (NSFC), grant No. 51105170. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.


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