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The effect of preorganized versus undefined charge display on the cellular uptake of cationic cell‐penetrating peptides (CPPs) was investigated by comparing conformationally well‐defined guanidinylated oligoprolines with flexible oligoarginines. Flow cytometry and confocal microscopy studies with different cancer cell lines (HeLa, MCF‐7, and HT‐29) showed that preorganization of cationic charges in...
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