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. 2020 Mar 3;21(5):1731. doi: 10.3390/ijms21051731

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© 2020 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Alteration of cell cycle of A549 cells after exposure to various concentrations of ZnO NPs for (A) 24 h and (B) 48 h or CuO NPs for (C) 24 h or (D) 48 h. Values significantly different from the control (p’s < 0.05) are indicated with *.