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Comparsion of the levels of cytokines between COPD and AECOPD patient. The level of IL-2, TNF-α, IFN-r, IL-4, IL-6, IL-10 in serum of patients with stable- COPD (n = 41), AECOPD (n = 35) and healthy control (n = 62) were analyzed by flow cytometry microsphere array (CBA). Data represent mean ± SD. *P < 0.05; **P < 0.01; ***P < 0.001, controls versus stable-COPD, AECOPD group. # P < 0.05; ### P < 0.001, stable-COPD versus AECOPD.
