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(a) Gas chromatography mass spectrometry chromatograms of cholesterol and its oxidation products in HepG2 cells; (b) oxysterols content in HepG2 cells treated with vehicle, H2O2 (1.5 mM) and H2O2 and CeO2NPs (1.5 mM; 10 µg/mL). * p < 0.05 compared with control.
