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Percentage of depolarized adenocarcinomic human alveolar basal epithelial cells (A549) after incubation with micro- and nano-particles of different chemical composition. Reprinted with permission from [28], H. L. Karlsson, et al., Size-dependent toxicity of metal oxide particles—A comparison between nano- and micrometer size. Toxicol. Lett. 188, 112 (2009). © 2009, Elsevier.
