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. 2010 May 10;118(10):1363–1369. doi: 10.1289/ehp.0901661

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REM (A) and TEM (B) images of neuronal network cultures exposed to 5 μg/cm² Fe₂O₃ NPs for 24 hr. In A, particles were detected as agglomerates (large arrows) and as single particles (small arrows); bar = 5 μm. In B, NPs were detected inside cells (arrow); bar = 2 μm.