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Selectivity of CAMB sensor for Pb2+ over other competing divalent metal ions. The initial rate of fluorescence enhancement of the sensing system induced by different metal ions at three concentrations (0.5, 2 and 5 µM) are shown. The concentration for DNAzyme and substrate was 200 nM and 300 nM, respectively. The buffer solution contained 25 mM HEPES (pH 7.0) and 100 mM NaCl.
