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Schematic structure of human lung and airway: bioprinting of airway and lungs for tissue engineering and in vitro model. The physiological structures of the lungs (featuring the architecture of alveoli) and the trachea (featuring cartilaginous rings and connective tissue) are illustrated on the left. The bioprinted models of the lungs and the trachea are illustrated on the right, with engineered features corresponding to the native tissues.
