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YKL-40 levels in COPD subjects with low risk (GOLD category A+B) and high risk (GOLD category C+D) for future exacerbations.
Notes: Panels showing: YKL-40 concentration (A) in peripheral blood, (B) in sputum; YKL-40 mRNA expression (C) in peripheral blood, (D) in sputum. **P<0.01.
Abbreviation: PBMC, peripheral blood mononuclear cells.
