Additional file 4: Figure S2. of Global analysis of DNA methylation in hepatocellular carcinoma by a liquid hybridization capture-based bisulfite sequencing approach

Promoter classification based on CpG representation. A, the histograms represent the distribution of observed versus expected CpG frequencies for all promoters, displaying the low (LCPs, red), intermediate (ICPs, green), and high (HCPs, blue) CpG content promoters; B, the proportion of the three categories of promoters.