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A highly sensitive electrochemiluminescence (ECL) strategy was developed for the protein kinase A (PKA) activity and inhibition assay based on double-quenching of graphene quantum dots (GQDs) ECL by G-quadruplex–hemin DNAzyme and gold nanoparticles (AuNPs). In this strategy, the GQDs were modified onto the indium-tin oxide (ITO) electrode and further assembled with substrate peptide of target protein...
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