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. 2017 Aug 19;30(4):307–314. doi: 10.1293/tox.2017-0025

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©2017 The Japanese Society of Toxicologic Pathology

This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial No Derivatives (by-nc-nd) License. (CC-BY-NC-ND 4.0: https://creativecommons.org/licenses/by-nc-nd/4.0/）.

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Fig. 1. — Experimental design. Rats were divided into low- (1.1 mg/m³) and high-dose (4.9 mg/m³) exposure groups; further divided into two subgroups, those exposed to either ZnONPs or HEPA-FA; and sacrificed at 1 day, 7 days, or 30 days after exposure for two weeks. ZnONPs: zinc oxide nanoparticles. HEPA-FA: high-efficiency particulate arresting (HEPA)-filtered air.