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Collagen accumulation in the lung of C57BL/6 mice after repeated aspiration of SWCNTs, AB, or UFCB (40 micrograms per mouse, twice a week, for 3 weeks). Mean + SEM (n = 12 mice per group). *, p < 0.05 versus control PBS-exposed mice; α, p < 0.05 versus AB-exposed mice; β, p < 0.05 versus UFCB exposed mice.
