Fig. 8From: Assessment of the toxicity and carcinogenicity of double-walled carbon nanotubes in the rat lung after intratracheal instillation: a two-year studyA shows a TEM image of a rat lung treated with DWCNT (0.5Â mg) showing several very thin curved fibers (arrow and at higher magnification in the boxed area) in a multinucleated giant cell. B shows a TEM image of rat lung treated with MWCNT-7 (0.5Â mg) showing rigid fibers in the cytoplasm of an alveolar macrophage. Inset shows an enlarged view of an MWCNT-7 fiber in the macrophage cytoplasmBack to article page