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Hematite nanoparticles larger than 90 nm show no sign of toxicity in terms of lactate dehydrogenase release, nitric oxide generation, apoptosis, and comet assay in murine alveolar macrophages and human lung epithelial cells.
Freyria FS, Bonelli B, Tomatis M, Ghiazza M, Gazzano E, Ghigo D, Garrone E, Fubini B. Freyria FS, et al. Chem Res Toxicol. 2012 Apr 16;25(4):850-61. doi: 10.1021/tx2004294. Epub 2012 Feb 29. Chem Res Toxicol. 2012. PMID: 22324577 Free article.