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Collagen accumulation in the lung 1 yr postaspiration of CNF, SWCNT, or asbestos. Mice were exposed via pharyngeal aspiration with SWCNT (40 μg/mouse), CNF (120 μg/mouse), or crocidolite asbestos (120 μg/mouse) and by inhalation to SWCNT (lung burden of 5 μg). Animals were killed 1 yr postexposure. Means ± SE (n = 6 mice per group). *P > 0.05 vs. control; αP > 0.05 vs. CNF aspiration exposure; βP > 0.05 vs. asbestos aspiration exposure; ωP > 0.05 vs. SWCNT aspiration exposure.
