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Inflammatory cell total counts and differentials in BAL fluid at 3 or 60 days after exposure to a low or high dose of purified and functionalized MWCNTs. a Average cell counts (based on 3 representative photomicrographs). b Macrophages (per 500 cells). c Neutrophils (per 500 cells). d Lymphocytes (per 500 cells). Statistically significant difference to the vehicle control: *** P < 0.001, ** P < 0.01, * P < 0.05 or to the NC7000 parent MWCNT sample: ^^^ P < 0.001, ^^ P < 0.01, ^ P < 0.05
