To avoid such errors in the new study, they tagged each Neanderthal DNA strand with a unique molecular bar-code, to distinguish it biochemically from any extraneous genetic material.
因此在新的研究中，为避免再出现这种错误，他们将每一条尼安德特人的DNA都标记出来，以区别于所有外来的遗传物质。
Images are resized to stay within the column and all the extraneous material on a page is removed.
图片会做调整以保持在列，而页面上所有的多余材料会被取出。
This study validated the ability of a filter to effectively remove undesired extraneous material even with an inoculant pellet embedded in the filter.
本研究证实，即使安置有一孕育块，过滤器也具有有效地去除不希望的外来物质的能力。
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