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. 2019 Jun 11;16:21. doi: 10.1186/s12989-019-0306-4

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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. 4 — DNA strand breaks in peripheral blood mononuclear cells after exposure in electric and diesel trains. The circles in grey represent DNA strand breaks in electric train (one exposure scenario) or diesel train (mean of two exposure scenarios). The dark line represents the mixed-effects model without adjustments. Higher levels of DNA strand breaks were observed on group level (solid symbols) after exposure in diesel trains (p < 0.05)