Saline, OM, SO, and NFO groups demonstrated histologically normal livers (top row), spleens (middle row), and lungs (bottom row) after 19 days of treatment. PFO66 and PFO90 groups developed hepatic and splenic lipid-laden macrophages without evidence of inflammation or necrosis; as well as pulmonary fat deposits. All panels are stained with hematoxylin and eosin. Magnification is 400X for all groups. For PFO66 and PFO90 groups, a portion of hepatic and pulmonary slides further magnified to emphasize lipid-laden macrophages and pulmonary fat.