mortality/aging
• some mice die within 6 hours after birth with cyanosis and rapid breathing
• all die within 24 hours of birth
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respiratory system
• variably thickened in small distal gas exchange sacs due to impaired thinning during sacculation and defects in microvascular maturation
• however, mice exhibit normal lung epithelial cell differentiation and cellular kinetics and composition in the distal lung
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• in some mice after birth
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homeostasis/metabolism