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Proinflammatory cytokines of MIP-2, TNF-α, and IL-6 in BALF 4 hr postexposure to NR and FR PM (n = 7 mice/group). Abbreviations: C, coarse; F, fine; SAL, saline; U, ultrafine. Error bars indicate SE.
*p < 0.05, and **p < 0.01 compared with saline.
