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(A) F1 calibration curve for OTA (n = 3). (B) F2 with complementary chain (A13) calibration curve for OTA (n = 3). The inset shows the linearity of the fluorescence quenching (F0-F) with respect to the OTA concentrations. The F1 and F2 aptamer, and complementary chain concentrations were 20 nmol/L and 60 nmol/L, respectively. The error bars represent the standard deviation of the triplicate measurements.
