Fig. 5

A shows CD68 immunostaining of lung tissue from rats in the (a) Vehicle, (b) 0.5 mg DWCNT, and (c) 0.5 mg MWCNT-7 groups at the final sacrifice. B shows PCNA immunostaining of the lung tissue from rats in the (d) Vehicle, (e) 0.5 mg DWCNT and (f) 0.5 mg MWCNT-7 0.5 groups at the final sacrifice. C shows Masson’s trichrome collagen staining of lung tissue from rats in the (g) Vehicle, (h) 0.5 mg DWCNT, and (i) 0.5 mg MWCNT-7 groups at the final sacrifice