The genetic information of all living cells is stored in the DNA composed of the four canonical bases adenine (a), cytosine (c), guanine (g) and thymine (t).

所有活细胞的基因信息都储存在由四种碱基，即腺嘌呤(A)、鸟嘌呤(G)、胞嘧啶(C)、胸腺嘧啶(T)构成的DNA里。

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Moreover, the difference was largely accounted for by something strange. Previous studies have shown that methylated cytosines are usually next to a letter called guanine (G).

此外, 造成它们的差别的主要原因却很奇怪, 先前的研究显示, 甲基胞核嘧啶通常在鸟嘌呤(G)字母的旁边.

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This article's examples use DNA, which consists of two strands of adenine (A), cytosine (C), thymine (T), and guanine (G) nucleotides.

本文的示例使用 DNA，DNA 由腺嘌呤（A）、胞嘧啶（C）、胸腺嘧啶（T）和鸟嘌呤（G）组成的核苷酸双螺旋组成。

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The four bases - adenine (A), guanine (G), thymine (T), and cytosine (C) - spell out the genes.

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The "G" refers to guanine, one of the four chemical groups, or "bases", that hold DNA together and which encode our genetic information (the others being adenine, cytosine, and thymine).

BBC: 'Quadruple helix' DNA seen in human cells

The G-quadruplex seems to form in DNA where guanine exists in substantial quantities.

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