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Square wave voltamogram of FMN (0.1 mM) in HEPES buffer (10 mM; pH=7) with KCl 10 mM (black squares) and square wave voltamogram of FMN (0.1 mM) in HEPES buffer (10 mM; pH=7) in the presence of the modified PEI (2,5 mM in monomer; red circles). Step potential 0.005 V, amplitude −0.020 V, frequency 25 Hz.
