Figure 6From: Cell cycle alterations induced by urban PM2.5 in bronchial epithelial cells: characterization of the process and possible mechanisms involved PM fractions effect on the cell cycle. BEAS-2B cells were exposed for 3, 10, 24 and 40 h to 7.5 μg/cm2 of whole-PM, the equivalent amount of organic fraction and washed particles. The results are representative of 3 independent experiments. *Statistically significant difference from untreated cells (control), P < 0.05.Back to article page