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Human lung samples show a polarized distribution of epithelial CXCL11 in vitro, which is increased in patients with COPD. A–F, Lung tissue from patients stained for human CXCL11. Epithelium from patients with COPD (A–C, E, and F), or control patients (D), stained with secondary Ab alone (A), isotype-matched control Ab (B), or anti-CXCL11 Ab (C and F). The airway lumen is marked with *. Scale bar, 10 μm.
