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Viability percentages of (a) free DOX and (b) DFNPs on MCF-10A and MDA-MB-231 cell lines after 72 h. * p < 0.05, ** p < 0.01, and **** p < 0.0001 vs. each control (two-way ANOVA followed by Tukey’s post-test; data are expressed as mean ± SD of three independent experiments).
