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Levels of total protein (Panels a & e), malonaldehyde (MDA; Panels b & f) and surfactant protein D (SP-D; Panels d & h) in bronchoalveolar lavage fluid in Sprague Dawley and Brown Norway rats as a function of deposited lung dose of silver nanoparticles. Phospholipid levels (Panels c & g) were measured in the large aggregate fraction. Data shown as mean ± SD (n = 8–12 rats per group). *P < 0.05, **P < 0.01, ***P < 0.001 versus the Air only control (0) within each time-point
