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Fluorescence intensity of the fluorescent biosensor in the presence of exosomal miR-21 (1 pM), SM (single-base mismatch, 10 pM), DM (double-base mismatch, 10 pM), TM (triple-base mismatch, 10 pM), random (10 pM), and blank, respectively. (Error bars: SD, n = 3).
