Bisulfate-sequencing of HOXA11. Each row represents an individual cloned allele. Circles represent CpG sites and their spacing accurately reflects the CpG density of the region. The black circles and blue arrows show methylated CpG sites; the white circles and red arrows show unmethylated CpG sites. There are two representations of graph under the each row. (A) gastric cancer tissue, (B) peri-cancer tissue, (C) normal gastric mucosa.