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(a) A scheme of a label-free fluorescence biosensor for detection of Hg2+ based on Exo I Reprinted with permission from [55]. Copyright 2012 Elsevier. (b) A scheme of an optical ultrasensitive DNA biosensor to detect Hg2+ based on dark-field microscope and Exo I. Reprinted with permission from [56]. Copyright 2019 Springer Nature.
