Fig. 1
From: PM2.5 obtained from urban areas in Beijing induces apoptosis by activating nuclear factor-kappa B
Effects of PM2.5 on cell viability. CHO cells were cultured in 24-well plates at a density of 5.0 × 104 cells/ml in 0.5 ml of F12-K medium supplemented with 10% FBS and incubated overnight. The medium was changed, and the cells were treated with PM2.5 for 24 h. After 24 h, cell proliferation was measured by MTT assay. The data are expressed as the mean ± SD. Each data point represents an average of 12 samples. Experimental samples are compared with the untreated control, **P < 0.01