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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. 6 — Microbial species differences between plaque, modern calculus, and historic calculus. a The majority of taxa detected are shared between plaque, modern calculus, and historic calculus. b Relative abundance of Socransky’s bacterial complexes in plaque and calculus, presented by age and health status. *p < 0.05 vs. modern plaque, ^xp < 0.05 vs. modern healthy site calculus