respiratory system
• at E18.5 mutants lungs display more undifferentiated endoderm, a higher number of proliferating cells, and an indistinct boundary at the site of the future bronchioalveolar duct junction
• differentiation of progenitor cells into proximal or distal cell types is reduced
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• primitive alveoli are absent at E18.5 instead the lings contain many distal epithelial tubules surrounded by abundant mesenchyme
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