Fig. 7. (A) Linear relationship between the Cy3 counts and the logarithm of the A549 cell number. (B) Linear relationship between the Cy5 counts and the logarithm of the A549 cell number. The Cy3-labeled molecular beacon (0.3 μM), the Cy5-labeled molecular beacon (0.3 μM) and APE1 (0.1 U μL^–1) were used in this research. The error bars represent the standard deviations of the three experiments.