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T4 polynucleotide kinase (PNK) plays a critical role in various cellular events. Here, we describe a novel colorimetric strategy for estimating the activity of PNK and screening its inhibitors taking advantage of the efficient cleavage of λ exonuclease and the horseradish peroxidase-mimicking DNAzyme (HRPzyme) signal amplification. A label-free hairpin DNA with the sequence of HRPzyme was utilized...
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