Figure 2.
CpG site distribution and overlap among included papers in the meta-analysis. Research groups focused on distinct regions of promoter and exon 1F. Six out of the 7 papers included in the meta-analysis assessed the DNA methylation of a small cluster of CpG sites located immediately preceding exon 1F, from 35 to 39; additionally, Murgatroyd et al. limited their analyses to CpG sites 35 and 36 as they had been already pointed out as informative in the previous papers. The whole sequence of this region is displayed in Figure 3.