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(A) Schematics for illustration of the transdermal H2O2 electrochemical biosensor on the basis of the conductive MN patch with Pt/rGO surface. Reproduced with permission (Jin et al., 2019). Copyright 2019, Wiley. (B) Schematics for the working mechanism of silk/D-sorbitol microneedle electrodes. Reproduced with permission (Zhao et al., 2020). Copyright 2019, Royal Society of Chemistry.
