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Pro-fibrotic cytokines in the BAL fluid at 3 or 60 days after exposure to a low and high dose of purified and functionalized MWCNTs measured by ELISA. a CCL2. b OPN. c TGF-β1. Statistically significant difference to the vehicle control: *** P < 0.001, ** P < 0.01, * P < 0.05, the parent NC7000 MWCNT sample: ^^^ P < 0.001, ^^ P < 0.01, or the chemically-purified CP7000 sample: ### P < 0.001, ## P < 0.01
