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Chinese doctors in Xi’an, northwest China’s Shaanxi Province, successfully transplanted an ear on a patient after it had been regenerated on his arm. The operation on Wednesday lasted seven hours. The new ear was made with cartilage from the patient’s ribs and modelled with the help of 3D-printing technology. It was then attached to his forearm under a piece of expanded skin, where it was allowed to grow for several months until experts deemed it ready for the transplant. The patient had lost his right ear in a traffic accident last year.