Anti-occludin, anti-claudin and anti-junctional adhesion molecule (JAM) staining of the five groups (original magnification, x100; insert, x400). (A) Asthmatic control, (B) untreated asthma, (C) etanercept, (D) dexamethasone and (E) bevacizumab groups. Within these: (a) Occludin, (b) claudin; and (c) JAM immunoreactivity. *Immunoreactivity. Ep, epithelium.