238351.fig.002
Figure 2: Results of WST-1 assays of human corneal epithelium (HCE) cells after incubation with 2 kinds of gelatin nanoparticles for 2 h. (GP+, GPs with positive surface charge; GP−, GPs with negative charge. Data were analyzed using the Student’s t-test and are presented as mean ± standard deviation (SD); , ).