1.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%，一个人可能有而另一个人有鸟。

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

SIRT1的合成取决于一种叫NAD（辅酶）的分子，而NAD的合成则取决于一种叫NMN的物质。

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

DNA 由四种有机基组成：、鸟、胞啶和啶，即 A、G、C 和 T。机翻

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

看，DNA 由四种称为“基”的不同构件组成：、胞啶、鸟和啶。机翻

5.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种化学成分——、鸟、胞啶和啶——这4种成分总是以特殊的配对方式排列。

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

基——基因子母表中的字母——由前面我们提到的、鸟、胞吟和啶4种核苷酸组成。

7.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、磷酸以及四个核基之一组成，分别是、胞啶、鸟与啶，或简称A、C、G、T。

8.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.

该作用可以让甲基（由一个碳原子和三个氢原子组成）附着于或胞啶上——组成DNA序列的四种主化学成分中的两种，到底附着的是哪种取决于涉及到的基因种类。