The researchers also made what they say are the first sequences of nuclear dna from the extinct american mastodon .

据研究者说，他们还首次完成了已灭绝的美洲乳齿象细胞核dna序列的测定。

The mastodon became extinct about 10000 years ago - around the same time that mammoths disappeared from most of their range .

美洲乳齿象在约1万年以前灭绝－几乎在同一时间猛犸象也从大多数它们分布的地方消失了。

The researchers compared sequences of dna from the nuclei of african and asian elephants , and from woolly mammoths and the american mastodon .

研究人员对比了非洲象和亚洲象，以及来自猛犸象和美洲乳齿象的细胞核dna序列。

Although mastodon mitochondrial dna has been sequenced before , the researchers say they were the first to do the analysis on dna from the cell nucleus - in this case , using material from a tooth .

尽管此前已完成了美洲乳齿象的线粒体dna测序，研究者表示他们还首次实现了对细胞核dna的测序－在本例中使用的材料来自牙齿。

Crack the skye mastodon cd sealed new 2009 .

破解光盘密封斯凯乳齿象2009年新。