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Fluorescence anisotropy in the presence of (A) MgCl2, (B) MgSO4 and (C) the absence of magnesium ions. Concentrations: 100 nM FAM-DNA, 100 nM cDNA, 10 μg/mL graphene oxide materials, 10 mM MgCl2 and 10 mM MgSO4. (* p < 0.05, ** p < 0.01, *** p < 0.001).
