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Relative mRNA expression of selected genes (Ccl20, Cxcl2, Ccl2, Il6) analyzed by real‐time PCR in lung tissue collected at 4 h postexposure from female mice exposed to ozone (O3) or filtered air (FA) in the luteal or follicular phase of the estrous cycle (n = 12). Results are expressed as means ± SEM. Significant differences were analyzed by ANOVA (*P < 0.05, ***P < 0.001).
