Figure 2: GFP-positive rate of HSP sensor cells. The cells were cultured on TCPS for 24 h and then exposed to 8 μg/mL CdCl2 for 8 h. The GFP-positive cells were counted by flow cytometric analysis. Data represent the mean ± SD of three experiments with ** and * indicating P < 0.01 and P < 0.05.