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(A) WT ( = Tyr::Cre/°; +/+) and (B) ctnnb1Δex3 mice. Note the disorganized alveolae of the mutant lung. Nonetheless, the lung cells do not express the ctnnb1Δex3 transgene, suggesting that the effect is cell non-autonomous. Scale bars, (A, C, D) = 50 µm, (B) = 20 µm.
