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. 2017 Feb 17;17:38. doi: 10.1186/s12866-017-0950-5

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© The Author(s). 2017

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 — PDLSCs infected with P. gingivalis ATCC 33277 under transmission electron microscopy. The nucleus was large and round, and organelles were abundant in PDLSCs (a). P. gingivalis ATCC 33277 could invade PDLSCs after 2 h of incubation (b, c-A). Endocytic vacuoles were not found surrounding internalized P. gingivalis. The bumps observed were stretched membrane where the PDLSCs packaged P. gingivalis ATCC 33277 (b, c-B)