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Representative lung sections stained for α smooth muscle actin (αSMA, A–D) and elastin (E–H), double-stained for von Willebrand Factor (blue) and αSMA (brown I–L) and HE stained heart sections (M–P) of rat pups kept in RA (A,B,E,F,I,J,M,N) or 100% O2 (C,D,G,H,K,L,O,P) until 10 days of age. Pups were injected twice a day with 0.9% NaCl or 2.5 μg kg−1 BMP9. LV, left ventricle; RV, right ventricle.
