But for the remaining .1%, one person might have an adenine where another person has a guanine.

但对于剩下的0.1%，一个人可能有腺嘌呤而另一个人有鸟嘌呤。

SIRT1 depends on a molecule called NAD (Nicotinamide adenine dinucleotide), and NAD, in turn, depends on the substance called NMN.

SIRT1的合取决于一叫NAD（辅酶）的分子，而NAD的合则取决于一叫NMN的物质。

DNA is made of four organic bases: adenine, guanine, cytosine, and thymine, or A, G, C, and T.

DNA 由四有：腺嘌呤、鸟嘌呤、胞嘧啶和胸腺嘧啶，即 A、G、C 和 T。

See, DNA is made up of four different building blocks called " bases" : adenine, cytosine, guanine, and thymine.

看，DNA 由四称为“”的不同构件：腺嘌呤、胞嘧啶、鸟嘌呤和胸腺嘧啶。

It was known that DNA had four chemical components - called adenine, guanine, cytosine, and thiamine - and that these paired up in particular ways.

当时已经知道，DNA含有4化学分——腺嘌呤、鸟嘌呤、胞嘧啶和胸腺嘧啶——这4分总是以特殊的配对方式排列。

The bases - the letters of the genetic alphabet - consist of the four nucleotides mentioned a page or two back: adenine, thiamine, guanine, and cytosine.

——因子母表中的字母——由前面我们提到的腺嘌呤、鸟嘌呤、胞嘧吟和胸腺嘧啶4核苷酸。

Nucleotides of DNA are made out of a sugar deoxyribose, a phosphate, and one of the four nuclear bases: adenine, cytosine, guanine, and thymine or A, C, G, T for short.

DNA的核苷酸由脱氧核糖、磷酸以及四个核之一，分别是腺嘌呤、胞嘧啶、鸟嘌呤与胸腺嘧啶，或简称A、C、G、T。

This attaches methyl groups (a carbon atom and three hydrogens) to either adenine or cytosine, two of the four chemical bases that form the alphabet of DNA, depending on the gene involved.

该作用可以让甲（由一个碳原子和三个氢原子）附着于腺嘌呤或胞嘧啶上——DNA序列的四主化学分中的两，到底附着的是哪取决于涉及到的因类。