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(A) Molecular structures of MC-LR and its analogues, MC-RR and MC-YR. (B) (i) Steady-state fluorescence spectra and (ii) real-time fluorescence response at 565 nm of the aptasensor in the absence of microcystin as well as in the presence of 20 μg/L MC-LR, 100 μg/L MC-RR and 100 μg/L MC-YR. (C) SERS spectra of the aptasensor in the presence of 20 μg/L MC-LR, 100 μg/L MC-RR and 100 μg/L MC-YR.
