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. 2018 Jan 3;15:2. doi: 10.1186/s12989-017-0238-9

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© The Author(s). 2018

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. 2 — Number of neutrophils detected in BAL fluid following intratracheal instillation of 162 μg of TiO₂, CeO₂ or CB NPs measured 1, 28 and 180 days after exposure. Particle exposed groups n = 6, vehicle control n = 6. All values are presented as mean + SD. An asterisk (*) denotes P ≤ 0.05, (**) P ≤ 0.01, (***) P ≤ 0.001 of neutrophil levels in exposed groups versus vehicle control