This research was supported by National Basic Research Program of China (Grant No. 2011CB808905), National Natural Science Foundation of China (Grant Nos. 41227801, 41273004, and 412003028), Knowledge Innovation Program of the Chinese Academy of Sciences (Grant No. KZCW2-YW-Q08-4) and Instrument Developing Project of the Chinese Academy of Sciences (Grant No. YZ201433). We thank anonymous reviewers for their generous helps to improve the manuscript, and also appreciate members of experimental paleontology research group for their stimulating discussions and constructive suggestions.
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supported by National Natural Science Foundation of China (Grant No. 41021002)
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