Fig. 2

IL-9 deficiency decreased HDM-induced inflammatory cellular infiltration. a Left: representative photomicrographs of haematoxylin and eosin-stained lung sections from WT and Il9^−/−mice challenged with HDM and saline (magnification ×10). Right: semi-quantitative scoring of the severity of inflammatory infiltrates in the airways. b Numbers of total cells, eosinophils, neutrophils and lymphocytes in bronchoalveolar lavage fluid (BALF) of WT and Il9^−/−mice challenged with HDM and NS. Bars show the mean ± SEM (n = 4–6 in each group). *p < 0.05, **p < 0.01, ***p < 0.001