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The total protein concentrations of cell-free bronchoalveolar lavage (BAL) fluid in response to carbon nanofibers, SWCNT, or asbestos. Mice were exposed via pharyngeal aspiration with SWCNT (40 μg/mouse), CNF (120 μg/mouse), or crocidolite asbestos (120 μg/mouse). Animals were killed 1 yr postexposure. Means ± SE (n = 6 mice per group). *P > 0.05 vs. control.
