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Fig. 2. (A) Fluorescent spectra of HE after reaction with X and XO, in the absence and presence of Mn3O4 NPs. X for xanthine and XO for xanthine oxidase, respectively. (B) Dependence between the elimination of ˙O2– and concentrations of Mn3O4 NPs, CeO2 NPs, and natural SOD.