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Ochratoxin A (OTA) is a toxic metabolite commonly found in various foods and feedstuffs. Accurate and sensitive detection of OTA is needed for food safety and human health. Based on a common OTA‐binding aptamer (OTABA), two structure‐switching OTABAs, namely OTABA4 and OTABA3, were designed by configuring a split G‐quadruplex and a split G‐triplex, respectively, at the two ends of OTABA to construct...