1·The genetic switch involves acetylation, the introduction of an acetyl group into a molecule at the DNA level of chromatin resulting in genetic transcription.
基因“开关”涉及乙酰化作用，也就是将乙酰基群在染色质的DNA水平上引入到分子中，由此完成基因转录。
2·These help a mitochondrial enzyme called carnitine acetyl transferase to do its job.
这能有助于一种叫做肉碱乙酰转移酶的线粒体酶的活动。
3·A small molecule called an acetyl group attaches to a particular histone known as H4.
一个小小的分子称作一个乙酰基团，它黏在一个称作h4的特殊组蛋白上。
4·Specifically, the study describes an acetyl genetic switch that produces memory impairment in aging 16-month-old mice.
特别是，这项研究描述了一种乙酰基遗传“开关”，这直接导致了一只16个月大的白鼠记忆上的损伤。
5·By 1897 a synthetic derivative (acetyl salicylic acid) of the plant's active ingredient (salicin) was created.
到了1897年，一种取自柳树的活性成分柳醇(水杨苷)的衍生合成物——乙酰水杨酸诞生了。