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Distribution of iron after injection of SPION microbubbles in rat lungs, liver, and spleen at various time points visualized by Perl’s Prussian blue staining. SPION microbubbles/iron at 10 minutes, one week, and 6 weeks post injection in (A–C) the lungs, (D–F) liver, and (G–I) spleen. The size bar represents 25 μm.
Abbreviation: SPION, superparamagnetic iron oxide.
