Immunofluorescence staining for CCL11, CCL24 and CCL26 was conducted on adjacent cryosections obtained from a midlevel intrapulmonary airway of the left caudal lobe from each animal at 3 months of age. One representative infant monkey from each FA (a–d), HDM (e–h), ozone (i–l), and ozone + HDM (m–p) exposure group is shown. Purified goat IgG was used as a negative control (a, e, i, m). Each image panel contains a portion of the airway lumen (top), airway epithelium (center), and airway interstitium (bottom). The dotted line represents the basement membrane zone in panels a, e, i and m. The arrow in (h) points to a CCL26+ cell within the airway interstitium (scale bar= 10 μm).