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Immunohistochemical localization of AQP5 protein in human bronchi. AQP5 protein (brown staining) was localized in normal airway epithelium (A) and submucosal glands (C) of the bronchi, whereas the expression of AQP5 increased in the airway epithelium (B) and submucosal glands (D) of asthmatics. (Magnification ×200.)
