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. 2006 Dec 11;115(3):403–409. doi: 10.1289/ehp.8497

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Thin-section TEM images of HAECs incubated with metal oxide nanoparticles. (A) Fe₂O₃. (B) Y₂O₃. (C) ZnO. (D) Control (no nanoparticles). Abbreviations: n, nucleus; v, vesicle; black star, normal continuous cell membrane; white star, region of possible cell membrane discontinuity. Arrows denote metal oxide particles or particulate matter.