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Various linker and spacer types used for conjugation of the peptides to oligonucleotides for receptor-mediated targeted delivery described in this review. Adapted from (a) Ämmälä et al. [72], (b) Knerr et al. [79], (c) Ming et al. [53], (d) Gandioso et al. [89], (e) Halloy et al. [90], (f) Nikan et al. [91] and (g) Broc et al. [92].
