Expression profile of Panx1 and principal connexins in the adult conducting airways. Hematoxylin and eosin-stained section of human tracheal mucosa illustrating the surface airway epithelium and the tracheal glands. The localization of connexins and pannexin1 is depicted by a color code and schematically represented below the photograph (Panx1, blue line; Cx26, red dots; Cx30, yellow dots; Cx31; purple dots; Cx32, green dots; Cx43, brown dots)