mortality/aging
• mutants die shortly after birth even when doxycycline is administered throughout gestation
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respiratory system
• a significant increase in peripheral lung tissue and relatively normal branching morphogenesis are seen with doxycycline treatment; however, lobulation of the lungs is not restored
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• doxycycline treatment does not restore tracheal-bronchial cartilaginous ring formation
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skeleton
• doxycycline treatment does not restore tracheal-bronchial cartilaginous ring formation
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