Pulmonary vessel wall thickness-to-blood vessel diameter (PVWT/D) ratios and lung histology. PVWT/D ratios of saline- and MCT-treated mice, with or without marrow cell infusion or total body irradiation (A). Pulmonary blood vessel from saline/vehicle (B), saline/WBM (C), saline/TBI/WBM (D), MCT/vehicle (E), MCT/WBM (F), and MCT/TBI/WBM (G) groups. Red bar = 20 μm.