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Nyquist (A) and admittance (B) plots of anti-cTnI (mAb19C7, epitope region 41–49) bound to modified gold electrodes with the concentration of cTnI systematically varied from 1 ag/mL to 1 ng/mL (N = 3). The EIS spectra were recorded in the presence of 1 mM DPBS using an amplitude of 25 mV and the dc potential set to the OCP. The frequency range was between 0.01 and 100 000 Hz.
