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Effect of 0.4 FiO2 on Hoxb5 and Hoxa5 protein levels (Western blot and densitometry) in ex vivo fetal mouse lungs. Lungs with O2-induced altered branching had significantly decreased Hoxb5 (a) but unchanged Hoxa5 (b) protein levels. *P = 0.0009, Mean ± SEM, N = 8