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Cross-section through the (a–c) liver, (d–f) lungs, and (g–i) spleen from mice injected with Fe3O4 (a,d,g), Fe3O4@PEG 20 K (b,e,h) and Fe3O4@PEG 35 K NPs (c,f,i), respectively, and harvested at 10 days after intravenous administration; normal morphology; Hematoxylin–Eosin staining; 1000× magnification, scale bar 25 μm.
