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Schematic showing the chemical design of the PEG–SS–siRNA/CaP nanoparticle; (B) Hydrodynamic size distribution and (C) TEM micrographs of the synthesized PEG–SS–siRNA/CaP nanoparticle; (TEM scale bar: 100 nm). (Reprinted with permission from ref. [161]. Copyright 2009 WILEY)
