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AFM images of functionalized GCE surfaces for DNA mismatch detection. (a) Oxidized bare GCE. (b and d) DNA/oxidized GCE. (c) MWNTs/DNA/oxidized GCE. Scan sizes: 5 × 5 μm in (a), (b), and (c). 1 × 1 μm in (d) (reprinted from Shahrokhian et al. [96] with permission).
