Figure 2From: Coating carbon nanotubes with a polystyrene-based polymer protects against pulmonary toxicity Effects of MWCNT on macrophages in vitro - light microscopy observations. Representative light microscopy images of RAW 264.7 cells exposed for 24 h to culture medium alone (Control) or 100 μg/ml of carbon black (CB), crocidolite fibres, NT1, NT2 or NT3. Original magnification: x 20. Abbreviations are the same as in Figure 1.Back to article page