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. 2019 Jul 6;7:102. doi: 10.1186/s40168-019-0717-3

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© The Author(s). 2019

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 1 — Dental plaque and dental calculus contain distinct microbial communities. a Principal component analysis (PCA) clusters modern dental plaque distinctly from modern and historic dental calculus, while calculus samples do not separate by time period. b PCA clustering of calculus samples is not related to health status