Table 1. Physical properties of nanoparticles used in this study.
| Nanoparticles | Diameter (nm) | Polydispersity index | Zeta potential (mV) |
| PLGA | 129.0 | 0.178 | –22.8 |
| PLGA-Ru1 | 138.8 | 0.087 | –12.1 |
| hEGF-PLGA | 136.1 | 0.051 | –3.4 |
| hEGF-PLGA-Ru1 | 133.0 | 0.236 | –4.7 |
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