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. 2014 Oct 16;9(10):e111044. doi: 10.1371/journal.pone.0111044

Figure 1. Serum concentrations of selected cytokines before and after adjustment for TNF-α and IL-17.

Figure 1

The original values for the selected cytokines were quantitated in serum obtained from healthy nonsmokers (n = 20) and subjects with SCOPD (n = 23) and AECOPD (n = 21) by ELISA (A). To eliminate the mixed effects of inflammatory factors, the authors divided each original value by the arithmetic mean of a classical inflammatory marker, such as TNF-α (B) and IL-17 (C). The data are presented as the mean ± SEM, unless otherwise stated. *p<0.05 and **p<0.01.