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(A) Detection mechanism of the Mxene-based biosensor. Reprinted with permission from Ref. 87. Copyright © 2019 Elsevier B.V.; (B) Mechanism of monitoring the PSA using MoS2 nanosheet-based biosensor. Reprinted with permission from Ref. 88. Copyright © 2015 Springer-Verlag GmbH Germany, part of Springer Nature.
