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(A) Impedance spectra, (B) the difference in the impedance for 30mer ss-DNAs and ds-DNAs obtained before and after binding with mPurβ and (C) voltammograms for 30mer ss-DNAs and ds-DNAs obtained before and after binding to mPurβ. Impedance spectra and differential pulse voltammograms were recorded in a phosphate buffer solution of pH 7.4. The impedance and current changes reveal the degree of interaction between protein and DNA probes.
