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Tumor histological analysis after injection with iron-oxide contrast agents. Blue-violet staining of the viable periphery and red-pink staining of the necrotic core is evident in each H&E-stained tumor section. Iron from the MNPs stained blue in the tumor periphery 24 h after MNP injection. The scale bars are 25 µm in all H&E-stained images, and 10 µm in all Prussian Blue-stained images.
