Figure 2.

Cytospins of bronchoalveolar lavage (BAL) cells from rats exposed to for 21 days to carbon black ultrafine particles (A–C) or single wall carbon nanotubes, SWCNT (D–F). Carbon inclusions are indicated by arrows. Carbon bridges between macrophages formed only in SWCNT-exposed rats. Original magnification (40×), inset (80×).