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(a) Fluorescence emission spectra of the biosensor in the presence of miR-21 with different concentrations (0, 1 fM,10 fM, 100 fM, 1 pM, 10 pM, 100 pM, 1 nM); (b) fluorescence intensity as a function of miR-21 concentration. Error bars: SD, n = 3.
