Figure 2.

(A) Schematic of aptamer-based electrochemical sensor for IFN-γ. Reprinted (adapted) with permission from [64]. Copyright (2010) American Chemical Society. (B) Demonstration of the MB-tagged aptamer modified electrode. Reprinted (adapted) with permission from [65]. Copyright (2014) Elsevier. (C) Schematic diagram depicting the fabrication of Ap/ERGO/GCE-based electrochemical aptasensor for the detection of Pb²⁺. Reprinted (adapted) from [77]. Copyright (2019) MDPI, Basel, Switzerland, under the Creative Commons Attribution License.