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Representative examples of polyamide backbone modified cell-targeting peptides described in this study. (A) c(RGDfV) (Kessler, 1997), (B) c(RGDf(NMe)V) Cilengitide (Dechantsreiter et al., 1999; Marinelli et al., 2003), (C) Pep42-(Val-Cit)2-PABO-Dox (Yoneda et al., 2008), (D) D-SP5 (Li et al., 2015).
