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Selectivity of the electrochemical ELISA system to AFP (5 ng/mL) by comparing it to the interfering protein: glucose (50 ng/mL), carcinoembryonic antigen (CEA, 50 ng/mL), hepatitis B virus surface antigen (HBsAg, 50 ng/mL), L-cysteine (50 ng/mL), bovine serum albumin (BSA, 50 ng/mL), and the mixed sample containing 5 ng/mL AFP, 50 ng/mL glucose, 50 ng/mL CEA, 50 ng/mL HBsAg, 50 ng/mL L-cysteine and 50 ng/mL BSA.
