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. 2006 Dec 4;115(3):397–402. doi: 10.1289/ehp.9469

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Dark field micrographs of alveolar macrophages prepared by cytospinning and H&E staining from mice exposed subacutely to TiO₂ nanoparticles and necropsied at weeks 0 (A), 1 (B), 2 (C), and 3 (D) postexposure.