Figure 5. VEGF protein expression after alkali burn in the aqueous humor at different time points. Note: μg /l refers to protein concentration; * and ** refer to p<0.05 and p<0.01 when compared with the normal control group, respectively; # and ## refer to p<0.05 and p<0.01 when compared with the empty vector group, respectively. VEGF, vascular endothelial growth factor.