Figure 4
Immunohistochemistry in CAP+O 3 and FA exposed mice. Arginase 1 immunostained lung tissues from OVA/PBS, OVA/OVA mice from the sub-acute (A) and chronic (B) models exposed to filtered air or CAP+O3 (200× magnification; bar = 100 μm; representative images of n = 4-5 per group. Brown colour indicates immunopositivity, arrows highlight positive areas, key positive areas inset at 400× magnification; bar = 20 μm).