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.
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).
误食牛油果的皮和核会令宠物鸟心脏痛楚，最引发终心脏衰竭。
The skin and pit of avocados have been known to cause cardiac distress and eventually heart failure in pet birds.
只有4种：腺嘌呤、胸腺嘧啶、鸟嘌呤和胞核嘧啶。
There are just four kinds: adenine, thymine, guanine and cytosine.
只有4种：腺嘌呤、胸腺嘧啶、鸟嘌呤和胞核嘧啶。
There are just four kinds: adenine, thymine, guanine and cytosine.
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