Fig. 4
a Fluorescence emission spectra of methylated DNA sequences at different concentrations. a–l: 0 M, 10−16 M, 10−15 M, 10−14 M, 10−13 M, 10−12 M, 10−11 M, 10−10 M, 10−9 M, 10−8 M, 10−7 M and 10−6 M; b linear relationship between fluorescence intensity and logarithm of methylated DNA concentration