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a Cell viability of different concentration of RV-treated A549 cells. b Cell viability of cells treated with RV@Ft, RV@Ft-RGD + RGD, and RV@Ft-RGD with RV various concentration. c Cell apoptosis of A549 cells treated with PBS (control), RV, RV@Ft, RV@Ft-RGD + RGD, and RV@Ft-RGD by flow cytometry. **P < 0.01, compared with other groups, respectively
