Within the DNA of the cells in these polyps, there are specific stretches of nucleotides that are called CpG islands.

息肉细胞的DNA中有一些特定的核苷酸序列被称为CpG岛。

CpG islands are found in most promoter regions of genes which are the DNA sequences responsible for the initiation of gene transcription.

CpG岛位于绝大部分启动子区域，是一组负责转录起始的DNA序列。