Figure 1. Changes to airway wall morphology with chronic allergen challenge.

Representative sections from mouse trachea (panels a, b) and lung (panels c–f). Following chronic challenge with saline (a, c, e) or ovalbumin (b, d, f), sections were stained with Masson’s trichrome stain for collagen (a, b, e, f) or Alcian blue-periodic acid Schiff to assess epithelial changes (c, d). Bar = 100 µm.