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Western blot analysis of NGF in the lungs of the four treatment groups. Treatment with NGF increased the levels of NGF protein. Data are expressed as the mean ± standard error of the mean (n=8 per group). ▪P<0.01 compared with the control group and ▴P<0.01 compared with the OVA group. NGF, nerve growth factor; OVA, ovalbumin.
