Figure 2.

Immunohistochemical staining for macrophages (CD68) and T-lymphocyte subsets (CD5, CD4, and CD8) in lung tissue biopsy. (a) Lung tissue with well-formed granulomas, hematoxylin and eosin stain, 200× magnification. (b) Anti-CD68 (brown) and anti-CD5 (red) immunostaining, 400× magnification. (c) Anti-CD68 (brown) and anti-CD4 (red) immunostaining, 200× magnification. (d) Anti-CD68 (brown) and anti-CD8 (red) immunostaining, 40× magnification.