Changes in BMPR2 expression during the development of fibrosis. Immunoblot for BMPR2, ID1, P-SMAD 2/3, fibronectin (FN), and β-actin (A) and densitometries for BMPR2 (B), ID1 (C), P-SMAD 2/3 (D), and FN (E) from PBS- and BLM-exposed mice on days 14, 21, 25, and 33.