Cryostat sections of bronchial biopsies stained with antibodies against the ln γ2 chain. Allergic asthma (A), non-allergic asthma (B) and healthy control (C) (original magnification ×170). As shown in the figure epithelial staining was found both in the apical part of the columnar epithelium and in the basal cells. Staining of the apical part of the columnar epithelium was only found in intact epithelium from allergic asthmatics. The comparison of the thickness of SEBM is shown and the significant differences between the groups shown in the figure. Mayer's hematoxylin.