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Representation of the main miRNA nanocarriers according to their size. The nanoparticles used for therapeutic miRNA delivery have a size range of 1–500 nm (although generally recommended maximum size is up to 100 nm). In the order of size range the qdots are the smallest ones, followed by metallic nanoparticles (AuNPs and IONPs), core–shell NPs (Au or IO core), liposomes, dendrimers, MSNs and polymeric NPs
