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(a) Schematic of the label-free colorimetric platform for DNA by target-catalyzed hairpin assembly and the peroxidase-like catalytic of graphene/AuNPs hybrids. Reprinted with permission from Ref. [130]. Copyright 2016 Elsevier; (b) Schematic diagram of the sensing principle for miRNA detection by AgNPs-based assay. Reprinted with permission from Ref. [156]. Copyright 2021 MDPI.
