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(A) Cytotoxicity assay of cyclic polyarginine peptide-fatty acid conjugates against SK-OV-3 cells (24 h incubation). (B) Cellular uptake of a phosphopeptide, F′-GpYEEI (5 μM), in the presence of peptide-fatty acid conjugates (10 μM) in SK-OV-3 cells. Cells with no treatment were used as control.
