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. 2020 Jun 23;20(12):3561. doi: 10.3390/s20123561

Figure 3.

Figure 3

Schematic representation of the preparation of DNA biosensor. The thiolated DNA was covalently immobilized onto a gold-plated 3D-printed helix electrode. The modified electrode was then incubated with a DNA target, and the electrode was then exposed to methylene blue. Adapted from [114].