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. 2017 Sep 21;8:1789. doi: 10.3389/fmicb.2017.01789

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Copyright © 2017 Liu, Ding, Narsing Rao, Zhang, Zhang, Liu, Liu, Xiao and Li.

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) or licensor 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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COG classification of unigenes. A total of 7,576 unigenes had a COG classification among the 25 categories. The capital letters on the x-axis indicate the COG categories as listed on the right of the histogram.