Fig. 6From: Increased IFN-γ-producing Th17/Th1 cells and their association with lung function and current smoking status in patients with chronic obstructive pulmonary diseaseThe concentrations of plasma cytokines. a Interleukin-6, b transforming growth factor-β1, and (c) Interleukin-12 from never-smokers and smokers with normal lung function, and patients with COPD. A p value< 0.05 was considered statistically significantBack to article page