Polyarginine enters cells more efficiently than other polycationic homopolymers.

By D. Mitchell, Lawrence Steinman, D. Kim, C. Fathman, J. Rothbard. Journal of Peptide Research, 2000

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Cell‐penetrating peptides: 20 years later, where do we stand? (2013, background): “Moreover, it was demonstrated that the number of arginine residues is also crucial, with polyarginines of 7–15 residues presenting an optimal uptake [14,15].”
A Comprehensive Model for the Cellular Uptake of Cationic Cell‐penetrating Peptides (2007, background): “Alternatively, peptides, among them oligoarginine peptides (6), were designed de novo based on structure activity relationships of PTDs.”
Cell-penetrating peptides: design, synthesis, and applications. (2014, background): “For further reference, the reader is pointed to an in-depth model of peptide-based nanoparticle formation and internalization developed by Divita et al.72 Cellular Uptake Mechanisms of CPPs.”
CNS Delivery Via Adsorptive Transcytosis (2008, background): “HIV Tat peptide (48–60) GRKKRRQRRRPPQ Viral transcriptional regulator (48) Syn-B1 RGGRLSYSRRRFSTSTGR Protegrin 1 (34) Syn-B3 RRLSYSRRRF Protegrin 1 (34) Homoarginine peptides ((Arg)7 and (Arg)9) RRRRRRR(RR) Synthetic (57, 118 )”