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(A) Amperometric response of the immunosensor to different concentration of IgG, from a to h: 5 fg/mL, 50 fg/mL, 500 fg/mL, 5 pg/mL, 50 pg/mL, 500 pg/mL, 5 ng/mL, 50 ng/mL; (B) Calibration curves of immunosensor to different concentrations of IgG, error bar = RSD (n = 5).
