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Scheme for electrochemical detection based on (a) oxidation of 3,3,5,5-tetramethylbenzidine (TMB) in the presence of horseradish peroxidase (HRP), followed by (b) the reduction of this oxidized form back to the initial form of TMB at an electrode. This scheme makes it possible to detect the HRP label through its production of the oxidized form of TMB. This figure is adapted from Ref. [94].
