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Fluorescence intensities (RFU) of HeLa cells after incubation with 10 µM FAM-labeled CPPs. The peptides are sorted by signal intensities, with bars indicating the mean of two measurements. The inset shows examples of the performance of one CPP candidate each of high, medium and low uptake efficiency (fluorescence images of the cell layers with histograms detailing the respective brightness of untreated 12-bit images). Bar: 200 µm.
