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Cellular viability percentages of GNR of different surface modifications against human dermal fibroblasts. Anionic charged- and BSA-conjugated GNR demonstrated the highest cytotoxicity against human dermal fibroblasts. Data are presented as mean ± SD. One-way ANOVA was used to estimate the statistical differences; ** p < 0.01, *** p < 0.001 and **** p < 0.0001.
