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BPA aptamer selection and detection. (A) BPA aptamer selection: From the aptamer library (1015 ssDNAs), using SELEX, we selected aptamers specifically bound to BPA. (B) BPA detection with selected aptamers: Using 3-dimensional aptamer sol–gel chips, water samples contaminated with BPA were analyzed by fluorescence microscopy. ss, single-stranded; BPA, bisphenol A. Color images available online at www.liebertonline.com/oli
