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ST2 mRNA expression in peripheral blood mononuclear cells (PBMC) (a) and sputum cells (b) in n healthy non-smokers, healthy smokers and patients with COPD. Comparison of ST2 mRNA expression in PBMC (c) and sputum cells (d) between COPD subjects with and without sputum eosinophilia. Data are presented as mean ± SEM. **p < 0.01; ***p < 0.001; ****p < 0.0001
