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然而，干细胞里四分之一的甲基胞核嘧啶却没有鸟嘌呤随后。

A quarter of the methylated cytosines in stem cells, however, were not followed by guanines.

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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.

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).

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