“…Subsequently, various classes of CPPs, including arginine/lysine-rich cationic peptides, LMWP, Penetratin and VP22 [15,24,31,32,33,34], as well as amphipathic peptides such as MAP, MPG, pep-1, etc., were also reported and utilized in either remarkable intracellular delivery strategies or the successful application in medical and biological field [17,19,25,26,27,35,36,37,38,39,40,41,42,43,44,45,46,47,48]. Via covalent linkage or non-covalent charge-associated aggregation, linkage, both in vitro and in vivo results demonstrated that CPPs could assist the delivery of virtually all types of molecular cargos including proteins [2,16,20,26,46,49,50,51,52,53,54,55], nucleic acids [33,35,36,56,57,58,59,60], and nano-carriers such as magnetic iron oxide nanoparticles (MION) [61,62,63,64,65,66,67,68] into cells.…”