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(A) Square wave voltammetric responses of GCE-OLC-PAN-OVAAb-BSA toward OVA-antigen (7.8 × 10–15 fg/mL) and HPV-16 L1 antigen (7.8 × 10–15 fg/mL), (B) Bar chart describing the responses of HPV-16 L1 antibody toward HPV-16 L1 (7.8 × 10–15 fg/mL) before (initial) and after six regeneration steps (reg 1 – reg 6) on day 1 and day 7. At every regeneration step, the detection of HPV-16 L1 antigen was repeated five times.
