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To trace the source of meat, or even leather goods, scientists can use DNA barcoding, which uses a short genetic marker from the sample to identify it.

科学家可以使用基因条形码技术（通过来自样本的短基因标记来识别物种的技术），可以追朔肉甚至是皮革商品源于什么物种。

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But it is an open question, given all the genetic damage in a cancer cell, as to which type of damage would be the best marker of a tumor's presence.

不过，还有个悬而未决的问题：假定癌细胞内出现遗传损伤的情况，那么，哪种类型的损伤可以作为肿瘤存在的理想指标？

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Suppose that there were some sort of genetic marker and, although we didn't have a tattoo that you would just have to look at, -- but you could have genetic counseling-- have your DNA examined and you could tell, if you had the DNA testing, how much time you had left.

假设有某种基因标记，虽然我们没有,让你不得不去看的在身上的标记了，但你可能会去做基因咨询-,检查你的DNA，如果你做了DNA化验的话，你就能知道自己还剩多少时间。

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However, he suggests highlighting the presence of a genetic marker may help doctors diagnose the condition.

BBC: Sleepwalking is 'in the genes'

Chalfie's 1994 paper on the gene popularized it as a genetic marker.

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However, Professor Idzikowski said there was a possibility that sleepwalking could be a variation of an auto immune disorder, due to the genetic marker.

BBC: Sleepwalking is 'in the genes'