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Structure and location of tracheal vestibules in tracheal system of adult Tenebrio molitor. atv1–atv8, abdominal tracheal vestibule 1–8; fmt, flight muscles trachea; lt1, proleg trachea; lt3, metaleg trachea; ttv1, mesothorax tracheal vestibule; ttv2, metathorax tracheal vestibule.
