Use of most molecular marker systems depends on the polymerase chain reaction (PCR), which is an important technique for amplifying specific DNA sequences.

大多数分子标记体系的利用都取决于聚合酶链反应（PCR），这是一项扩增特定DNA序列的重要技术。

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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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It also has an extensive database of DNA, the most specific marker of personal identity.

它还有大量的DNA数据库-个人身份最特殊的标记。

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His 6-foot-5 frame hunched towards a laptop, Ressi trains a finger at a column of numbers, each data point like a genetic marker in the DNA of an entrepreneur.

FORBES: Can An Hour-Long Aptitude Test Predict Startup Home Runs? Adeo Ressi Thinks So

However, on closer examination, the new cells proliferating in the petri dish contained the florescent marker from the brain cells and the DNA from the embryonic stem cells.

BBC: Stem cell research doubts