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. 2020 Nov 12;11:570825. doi: 10.3389/fmicb.2020.570825

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Copyright © 2020 Gwak and Rho.

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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Classification of the salivary microbiome samples obtained from three different hygiene index groups. (A) The relative abundance of the top 10 abundant genera and (B) the relative abundance of the species belonging to the Streptococcus and Veillonella genera are presented. The assignment results for (C) the Streptococcus and (D) the Veillonella genera are represented by the network. Reference sequences are colored in purple and labeled using their species name. Each node except the reference node represents one OTU, and the bacterial composition of samples from the three hygiene index groups is plotted as a pie-chart (blue for good, orange for moderate, and green for poor). All OTUs are represented as being proportional to their log-scaled size, and all OTUs with a size of 10,000 or more are labeled with their OTU number.