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. 2007 Jun;115(6):A290. doi: 10.1289/ehp.115-1892118

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Inflammatory cell response in lung lavage 24 hr after intratracheal instillation of fine (~ 250 nm) and ultrafine (20–30 nm) TiO₂ expressed by different dose metrics [particle mass (A,B), number (C,D), and surface area (E,F)] and different response metrics [number of PMNs (A,C,E) and PMN/macrophage ratio (B,D,F)].