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Cyclic (a) and square wave voltammograms (b) of the bare carbon electrode (black), the gold nanoparticles-modified electrode (red), after functionalization with the 11-mercaptoundecanoic acid (green), after the immobilization of the anti-nucleocapsid antibody (blue) and after blocking with BSA (cyan). The measurements were performed in 5 mM ferro/ferricyanide redox solution in PBS buffer, pH 7.4
