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Single layer graphene device tested for microRNA structural differentiation by field effect transistor-electrical impedance spectroscopy (FET-EIS). (a) Schematic illustration of FET-EIS sensor with various components and structural ss-miRNAs and ds-miRNAs, (b-c) EIS measurements of FET sensor before and after functionalized with linker, and antimiR-21 and antimiR-21-miR-21 hybrid.
