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. 2014 Sep 3;10(1):22–31. doi: 10.1111/crj.12177

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© 2014 John Wiley & Sons Ltd

This article is being made freely available through PubMed Central as part of the COVID-19 public health emergency response. It can be used for unrestricted research re-use and analysis in any form or by any means with acknowledgement of the original source, for the duration of the public health emergency.

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Immunohistochemistry analysis of the expression of melanoma differentiation associated gene 5 (MDA‐5) and retinoic acid inducible gene I (RIG‐I) in bronchial mucosa. Representative images of immunohistochemistry in bronchial biopsy tissue for MDA‐5 in a chronic obstructive pulmonary disease (COPD) subject (A) compared with a control subject (B), and for RIG‐I in a COPD subject (C) and a control subject (D). Arrows indicate positive staining in the epithelium cells. Magnification: 400×.