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. 2019 Jan 9;9:3259. doi: 10.3389/fmicb.2018.03259

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Copyright © 2019 Wang, Xie, Wu, Sun, Wang and Huang.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Number of OTUs unveiled by DNA and RNA surveys. The pie chart indicated the OTU numbers mainly at class level; the inner ring represented these classes belong to the phylum; the outer ring indicated the number of OTUs at super-group level.