Figure 3. Effects of exogenous PGF on migration in ARPE-19 cells under hypoxia. A: Treatment with hypoxia alone or placental growth factor (PGF) alone did not affect the migration rate in the ARPE-19 cells compared with the control treatment, but the hypoxia+PGF treatment increased the migration rate in the ARPE-19 cells compared with the other three treatments. B: Quantitative analysis of the migration rates of the different groups is shown in the bar graph. Migration rate = [scratched area (0 h) – scratched area (12 h)] / scratched area (0 h). Data are the mean ± standard deviation (SD) of three independent experiments. Scale bar: 200 μM. *p<0.05 versus the other three groups.