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Detection and quantification by flow cytometry of HeLa (A) and MCF-7 (B) cellular uptake of FITC-labelled SFNs (green) and FITC-labelled RA-SFNs at an equivalent RA concentration of 0.226 mg/mL (black) after 24 h of cell exposure. In both cases, cells without any treatment were used as negative control (purple).
