Fig. 3.

Age-related effects of O₃ on neutrophilic chemokine expression in the lung. Expression of CXCL1 (a), CXCL2 (b) and CXCL5 (c) was analyzed in the lungs by real-time qPCR at 6 and 24 h after completion of exposure. Data are normalized to GAPDH and presented as mean ± SEM (n = 3–6 mice/group). *: p < 0.05, compared with age-matched FA-exposed controls; #: p < 0.05, compared with 1-week old group; $: p < 0.05, compared to all other age groups