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. 2022 Sep 5;14(9):1877. doi: 10.3390/pharmaceutics14091877

Figure 4.

Figure 4

Cross-section through (ac) brain, (df) myocardium, (gi) pancreas 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 two days after intravenous administration; normal morphology; Hematoxylin–Eosin staining; 400× magnification, scale bar 50 μm.