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DNA methylation status of three CpG islands in the ABCB1 promoter region in the stool DNA of healthy male Chinese volunteers. (A) Computational analysis of the CpG island distribution in the ABCB1 promoter region; (B–E) Distribution of the methylation levels of the ABCB1 promoter in individuals in total studied region, CpG island 1, CpG island 2 and CpG island 3, respectively. TSS, transcriptional start site.
