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. 2019 Mar 21;17:41. doi: 10.1186/s12951-019-0474-2

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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. 9 — Changed expression levels of testosterone synthetic genes, StAR (a), P450scc (b), 3β-HSD (c), P450c17 (d) and 17β-HSD (e) in testes of mice following the addition of various doses of CeO₂ NPs for 32 days. Values are mean ± SD, n = 6. Significance of difference: CeO₂ NPs group compared with control, * p < 0.05, ** p < 0.01