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Quantitative analysis of red fluorescence intensity in MDA-MB-231 and MCF-10A cells (blocked-FA+ or unblocked-FA- receptors) exposed to DOX@DFNPs. Intensity of free DOX treatments was inserted as control. **** p < 0.0001 vs. free DOX; * p < 0.05 vs. free DOX; ** p < 0.01 vs. free DOX; #### p < 0.0001 vs. DOX@DFNPs (FA+); °°°° p < 0.0001 vs. MCF-10A cells (FA-). (One-way ANOVA followed by Tukey’s post-test; data are expressed as mean ± SD of three independent experiments).
