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Effect of EDTA on the ability of quercetin to prevent 2-deoxyribose degradation in 20 mM KPB at pH 7.2. (a) 25 μM EDTA with Fe2+; (b) 25 μM EDTA with Fe2+ in the presence of 10 μM quercetin; (c) Fe2+ in the presence of 10 μM quercetin. [H2O2] = 200 μM.