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. 2008 May 21;116(9):1218–1225. doi: 10.1289/ehp.11172

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Size (mean ± SE) of atherosclerotic lesions after 30-day exposures of ApoE^−/− mice to clean air (n = 11), asbestos (n = 11), or TiO₂ (n = 6), and of DKO mice to clean air (n = 8) or asbestos (n = 8). Error bars represent the variance in the average lesion area per animal.

*p < 0.001.