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. 2019 Jul 5;9:9794. doi: 10.1038/s41598-019-46196-7

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© The Author(s) 2019

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as 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 images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Average intensity (auto-scaled) in OCT images of bacterial suspensions in PBS as a function of the optical density, OD_600, of the suspensions. Data involve different concentrations of widely different strains and species (S. epidermidis 252, S. epidermidis ATCC 35984, P. aeruginosa 39324, S. mutans UA159 or S. oralis J22). Different strains are indicated by different symbols, but not further specified due to overlap of data points at similar optical densities. Drawn lines represent the best fit to an assumed linear relation with correlation coefficient R² and significance of the slope P indicated.