The compositions associated with stop codons are constrained, it is one of factors that affects the base distribution in protein-coding genes.

这表明终止密码子在不同层次上限制基因组分的使用，是影响基因碱基分布的因素之一。

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Dr Wang has managed to reassign one of the stop codons in E. coli, the bacterial workhorse of geneticists, to recognise an unnatural amino acid.

王博士已经成功的让大肠杆菌(遗传学家的常用工作菌种)中的一个密码子重新分配去编码一个非自然氨基酸。

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Rather than inventing a new base pair, they have co-opted the least common of the three stop codons and used it to code for various new amino acids.

ECONOMIST: Chemists are trying to synthesise new varieties of life

The other three codons are signals to stop making the chain.

ECONOMIST: Chemists are trying to synthesise new varieties of life