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Total RNA was extracted from mouse lungs and subjected to analysis for IL-6, IL-1β, MIP-2, and iNOS using qRT-PCR. (A-D) Changes in the RNA level of pro-inflammatory mediators. ##p < 0.01, ####p < 0.0001 vs. the NC group; **p < 0.01, ***p < 0.001, ****p < 0.0001 vs. the PPE group.
