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DMT1 expression in rat lungs. In situ hybridization for DMT1 in control and iron oxide–instilled rat lungs at higher magnification (×25). (A) Control rat lung. (B) Lung section from an animal instilled with iron oxide particles from a region where few particles were found. (C and D) Lung section from an iron oxide particle–instilled rat from regions of particle retention (nominal magnification ×25). M, macrophage; P, macrophage with phagocytized particles.
