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We report on a programmable all‐DNA biosensing system that centers on the use of a 4‐way junction (4WJ) to transduce a DNAzyme reaction into an amplified signal output. A target acts as a primary input to activate an RNA‐cleaving DNAzyme, which then cleaves an RNA‐containing DNA substrate that is designed to be a component of a 4WJ. The formation of the 4WJ controls the release of a DNA output that...
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