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. 2003 Jul 16;100(16):9134–9137. doi: 10.1073/pnas.1633515100

Fig. 1.

Fig. 1.

A cyclic voltammogram for a gold electrode modified with the ferrocene-tagged, stem–loop oligonucleotide in the absence of target DNA (scan rate 0.1 V/s). The electrolyte is 1 M NaClO4.(Inset) The linear relationship between peak currents and scan rates confirms that the redox species is confined to the electrode surface (21).