Structurally, a gene is formed by three regions: a regulatory region called the promoter juxtaposed to the coding region containing the protein sequence, and a “3’ tail” sequence.

从结构上来讲，基因包含三个区域：称为启动子的调节区域；与其并列的编码蛋白质的密码子区域；以及3'端尾部序列。

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Up to one quarter of genetic mutations occur either in introns, noncoding segments of DNAsandwiched within the coding regions of a gene, or in sequences between genes.

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