DNA methylation shows chemical changes in a person's deoxyribonucleic acid,or DNA.

VOA: special.2009.11.24

So I show that here, so in green, you have what's called a carboxcylic acid group, a c o o h, which gets converted by s o c l 2 to a c double bond o c l or an acid chloride.

我在这里用绿色表示，我们所说的羧酸族化合物，碳，氧，氧，氢，它被亚硫酰氯转化为,一个碳氧双键与碳氯单键组成的酰氯。

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They would naturally hybridize and form a duplex, or a double stranded nucleic acid.

它们会自然杂交并形成双螺旋,或者说双链核酸

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I just wanted to point out that although you see these chlorine atoms in these drugs, in fact, I don't think I've ever seen an acid chloride in a final pharmaceutical product or drug that we take, and the reason is because they're so reactive that you wouldn't want to have that in something you digest.

我只是想指出一点,那就是尽管你在这些药物中看到了氯原子，实际上，我想我从来都没有在一个,成品的药用产品或者药物中见到过酰氯，这原因是因为它们太容易反应了,你不会想让它们出现在你要消化的东西中。

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When you think about a gene or a transcript, the messenger RNA copy of a gene, you know that for every sequence of a nucleic acid there's a complimentary sequence.

当你们考虑一段基因或者一个,转录一段基因的mRNA拷贝,你们知道每个核酸序列,都有互补序列

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