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Representative lung sections stained for pSMAD1 (A,B,D,E), pSMAD2 (G,H,J,K), and von Willebrand Factor (vWF; C,F,I,L) of rat pups kept in RA (A–C,G–I) or 100% O2 (D–F,J–L) until 10 days of age. The boxed areas in panels (A,D,G,J) are shown as high power magnification in panels (B,E,H,K), respectively. a, alveolus; Ar, arteriole; Br, bronchus.
