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Histological study of mouse liver specimens stained with Prussian blue (magnification ×200). (A), (B), (C): 30 minutes, 1, and 3 hours, respectively, after intraperitoneal (IP) injection of ultrasmall superparamagnetic iron oxide. (D), (E), (F): 30 minutes, 1, and 3 hours, respectively, after IP injection of small superparamagnetic iron oxide.
