Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Pulmonary histology of smoking control patients and COPD patients (hematoxylin-eosin [HE] staining, original magnification ×400). Evaluation of sub-epithelial and intra-luminal IgA accumulation in small airway of smoking control patient and COPD patients (immunohistochemical [IHC] staining, original magnification ×400). COPD: Chronic obstructive pulmonary disease; IgA: Immunoglobulin A.
