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Prussian blue stained PD-FeO NPs cellular internalization in HEK293 cells visualized under the light microscope (10× magnification). The blue staining indicated the presence of PD-FeO NPs. Control—(A), chitosan—(B), PVA—(C), CS/PVA—(D), PD-FeO NPs—(E), and CS/PVA-PD-FeO NPs—(F).
