Genomic distribution of methylated and unmethylated CpG islands.

<p>We subdivided CpG islands into methylated and unmethylated islands and then categorized them into different bins according to their sizes. A. Genomic distribution of methylated CpG islands. B. Genomic distribution of unmethylated CpG islands. The number of CpG islands in a particular bin was calculated in different regions and subsequently it was normalized by the total number of CpG islands in that bin. Here the genomic region 2 kb upstream and downstream of the transcription start site was regarded as promoter. A, B, C, and D indicated the group of Recessive White Rock with high body weight (WRR_h), Recessive White Rock with low body weight (WRR_l), Xinhua Chickens with high body weight (XH_h), and Xinhua Chickens with low body weight (XH_l), respectively.