(Arg)9

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(Arg)9 is a cell-permeable peptide used for drug delivery. It has been shown that poly-Arg peptides composed of 9 arginine residues are able to efficiently translocate across cells. It has also been shown in model systems that Arg-9 translocation involves nucleation of transient pores enabling flow of ions across the membrane, and that it's electrostatic attraction to the phosphate groups of membranes is a key property for its translocation.