Expression profile of Panx1 and principal connexins in the adult respiratory airways. Semithin section of human lungs illustrating the respiratory airway epithelium and its relation with the capillary bed. The localization of connexins and pannexin1 is depicted by a color code and schematically represented below the photograph (Panx1, blue line; Cx26, red dots; Cx32, green dots; Cx43, brown dots; Cx40, light blue dots; Cx46, pink dots)