Fig. 6From: Comparative carcinogenicity study of a thick, straight-type and a thin, tangled-type multi-walled carbon nanotube administered by intra-tracheal instillation in the ratTEM image of MWCNT-B engulfed by alveolar macrophages. a MWCNT-B fibers are phagocytosed by macrophages forming a multinucleated giant cell surrounded by fibrotic cells in an alveolus. b A higher magnification of the boxed section in panel A clearly showing abundant, tangled MWCNT-B fibersBack to article page