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Proliferative activity of AgNPs or CNFs in human keratinocyte (HaCaT) cells stimulated by their exposure to non-cytotoxic concentrations (10 and 20 µg/mL) for 72 (a) or 96 (b) hours. Data are shown as the mean ± standard deviation of six replicates. The ANOVA results of the AgNP and CNF concentrations and epidermal growth factor (EGF) with respect to control are given in the plot. * p < 0.05; ** p < 0.01; **** p < 0.0001; n.s: not significant.
