Figure 2 Bronchoalveolar lavage fluid albumin and lactate dehydrogenase. (A) Bronchoalveolar lavage fluid albumin concentrations and (B) bronchoalveolar lavage fluid lactate dehydrogenase activities were determined at 1, 7, 14, and 28 days postexposure. For each postexposure time, an "a" indicates a significant difference versus saline control group, and a "b" indicates a significant difference versus silica-exposed group. Values represent mean ± SE, n = 7–8 per group. Significance was set at p 0.05.