Figure 6From: Carbon black nanoparticles induce type II epithelial cells to release chemotaxins for alveolar macrophagesMacrophage migration induced by centrifuge fractions of conditioned medium from L-2 cells treated with nanoparticle carbon black (125 μg/ml). The positive control is indicated by the yellow bar representing migration towards ZAS. The negative control was conditioned medium obtained from untreated cells. Asterisks denote a significant increase compared to the negative control (* p < 0.05).Back to article page