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Furthermore, an aptamer-based fluorescent biosensor for metronidazole was constructed based on AP32-4. With the help of exonuclease-assisted target-recycling amplification, the biosensor exhibits a linear detection range of 25-800 nM, and the detection limit of 10.50 nM. The biosensor was applied to detect metronidazole in honey samples. The results show that not only an efficient strategy for screening robust and practicable aptamers, but also an ultrahigh sensitive detection platform for metronidazole were established.2,4,6-trinitroto