Figure 3.

BAL fluid protein (MTP) values for particulate-exposed rats and corresponding controls at 24 hrs, 1 week, 1 month and 3 months postexposure. Values given are means ± S.D. Transient increases in BAL fluid microprotein values were measured in the lungs of high dose (5 mg/kg) TiO₂-exposed rats at 24 hrs postexposure, but were not different from controls at 1 week postexposure. In contrast, exposures to 5 mg/kg quartz particles produced a sustained increase in BAL fluid microprotein values at 24 hrs, 1 week, 1 and 3 months postexposure. * p < 0.05.