IFT54 and chronic obstructive pulmonary disease: MIP-T3 mRNA and protein expression in COPD smokers (0.017 ± 0.007, 0.165 ± 0.035) declined significantly compared with nonsmokers (0.038 ± 0.003, 0.309 ± 0.041) and healthy smokers (0.043 ± 0.005, 0.325 ± 0.013) (Figures 2(d) and 2(e), P values <0.05).