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In this study, poly(ethylene glycol) (PEG)-block-polycation/siRNA complexes (PEGylated polyplexes) were wrapped with a hydrated silica, termed "silica nanogelling", in order to enhance their stability and functionality. Silica nanogelling was achieved by polycondensation of soluble silicates onto the surface of PEGylated polyplexes comprising a disulfide cross-linked core. Formation of silica...