Figure 2

Representative micrographs of M1 macrophages dual stained for iNOS (brown) and CD68 (blue). (a) Thin epithelium and thin walled normal control, (b) thick epithelium and thick walled COPD-CS, counterstained with nuclear fast red (pink). (
) Dual stained CD68 + iNOS + cells, (
) only CD68 + cells. CD163 staining M2 macrophages (c) NC (d) COPD-CS.