Fig. 4

Radiosensitizing effect by RGD-GNRs and/or NIR. A375 cells were exposed with DMEM (control group), NIR, RGD-GNRs (50 μg/ml) or RGD-GNRs + NIR for 1 h, then irradiated at 0–8 Gy with 6MV-X ray. Cells were trypsinized, counted, and seeded at different dilutions. Colonies of 0.50 cells were counted approximately 2 weeks after treatment.