In order to confirm the proposed EEC mechanism, cyclic voltammograms were simulated based the mechanisms described in equations 2-3, as well as SWV experiments. We fitted cyclic voltammograms to the experimental data from pH 5.5 and scan rate 5 Vs -1 , where a clear reduction peak is visible. The height of the peak cannot be fitted properly due to the presence of the strong background from oxidation of histidine Eox ~1.10 V, vs. Ag/AgCl. The model was fitted manually until a good agreement was found, thus the found values may not be optimal parameter values, but they should be relatively close. The optimised parameters show an ET standard rate constant for both reactions of ca 0.02-0.03 cms -1 , but the charge transfer coefficient for the Tyr oxidation (0.23) is significantly lower than for Cu (0.56).