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Cyclic voltammograms for 10 µM insulin in 0.1 M NaOH before and after cycling. Inset: Cyclic voltammograms to measure the stability in 5 mM K3[Fe(CN)6] for 30 cycles (A). Cyclic voltammograms for 5 mM K3[Fe(CN)6 obtained at 1st to 8th day of storage (B).
