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Cell viability (%) of HaCat cell line 24 h after incubation with uncoated and HAOA-coated GNPs at different concentrations, and EGF-conjugated HAOA-coated GNPs at 100 μM. * p < 0.05, ** p < 0.01 and *** p < 0.001 comparing to HAOA-coated GNPs at 25 µM. $ p < 0.05 and $$$$ p < 0.0001 comparing to uncoated GNPs in the same concentrations. Data are presented as mean value ± SD, n ≥ 3.
