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Differential pulse voltammograms for guanine oxidation of (a) bare PGE; (b) probe-modified PGE; (c) probe-modified PGE after hybridization with DENV-3 sequence; (d) non-complementary sequence and (e) a mixed solution of DENV-3 sequence and non-complementary sequence. Experimental conditions: Scanning potential range between +0.5 V and +1.2 V and scan rate of 0.05 V/s.
