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Figure 2: Lipid peroxidation measured by malondialdehyde (MDA) production in the lung (a), heart (b), liver (c), kidney (d), spleen (e), and brain (f), 24 h after intratracheal instillation of saline (control) or 0.5 mg/kg cerium oxide nanoparticles (CeO2 NPs) in mice. Data are mean ± SEM ( in each group).