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(a) Complexation between plasmid DNA and dipicolylamine-containing polymer through Zn(II) coordination. DPA, dipicolylamine. Adapted with permission.[31] Copyright 2018, American Chemical Society. (b) Complexation between siRNA and anionic mesoporous silica nanoparticle through their interaction with Ca2+ ion. MSN, mesoporous silica nanoparticle. Adapted with permission.[34] Copyright 2019, Elsevier Ltd.
