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Qualitative cell permeability assessment of the tested FAM-labeled peptides 1 – 4 for HEK293 (left) and MCF-7 (right) cells compared to its respective negative control. The employed membrane dye R18 depicts cell morphology. All peptides were administered at a final concentration of 2 μm, R18 at 1 μm. Scale bars: 50 μm.
