Figure 5From: Environmentally persistent free radicals induce airway hyperresponsiveness in neonatal rat lungs Light micrographs of exposed rat lungs. Light micrographs of terminal bronchioles (A, C) and alveolar parenchyma (B, D, E) from 15 d old rat lungs following exposure to DCB50, which was visually identical to air (A, B), and DCB230 (C-E). Black arrows denote significant peribronchiolar BALT; line denotes smooth muscle mass surrounding bronchiole (quantified in Figure 6); white arrow denotes lesions of increased alveolar space (quantified in inset of E); and white arrowhead demonstrates alveolar occlusion. Bar represents 50 μm (A, C) and 20 μm (B, D, E).Back to article page