has part has part has_part characteristic of has modifier abnormal trachea gland morphology decreased trachea gland number fewer than normal numbers of the tubuloacinar seromucous glands which are principally located in the submucosa of the trachea, open into the tracheal lumen through short ducts, and secrete mucus, lysozyme, defensins, and other agents that help protect the lungs from particles and infectious agents; in the mouse, they are restricted to the upper trachea, more specifically to the regions between the first few cartilage rings, with the precise distribution depending on genetic background reduced glandulae tracheales number decreased tracheal gland number reduced tracheal gland number MP:0013495 decreased trachea submucosal gland number reduced glandula trachealis number decreased glandulae tracheales number decreased glandula trachealis number reduced trachea submucosal gland number abnormal decreased amount trachea gland