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Schematic illustrations of delivery carriers and chemical conjugation strategies for nucleic acid drugs. Here shows typical delivery strategies: cholesterol conjugations [20,21,22], GalNAc conjugations [11,12,13,23,24,25,26], exosome [27,28,29,30,31,32,33,34,35,36], liposome [14,15,16,22,37,38,39,40,41,42], antibody [27,43,44,45,46,47,48].
