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(A) Flow cytometry histogram profiles of MCF-7 breast cancer cell line treated with coumarin-loaded non-targeted and Lf-targeted coumarin-labeled LCNPs for 4 and 24 h at 37°C. (B) Quantification of cellular level of mean fluorescence intensity in MCF-7 cells after 4- and 24-h incubation with free coumarin dye, non-targeted, and Lf-targeted coumarin-labeled LCNPs after 4 and 24 h at 37°C (n = 3, ****p < 0.0001).
