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. 2008 Jun 20;116(11):1500–1508. doi: 10.1289/ehp.11229

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Effect of Baltimore PM on T_H2 (A–C) and T_H1 (D–F) cytokine levels in BAL fluid. (A–C) Levels of BAL T_H2 cytokines IL-4 (A), IL-5 (B), and eotaxin (C) and (D–F) levels of BAL T_H1 cytokines IFN-γ (D), IL-6 (E), and TNF-α (F). Values are mean ± SE; n = 4–5.

*Significant increase over PBS/PBS control for each time point (p < 0.05). ^#Significant increase over PBS/OVA group for each time point (p < 0.05). S, synergistic effect between PM and OVA treatment (SI > 1).