研究人员说他们已经完成了首个美洲乳齿象的细胞核遗传学分析。
The researchers say they have also done the first nuclear genetic analysis of the 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 researchers also made what they say are the first sequences of nuclear DNA from the extinct 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。
The researchers compared sequences of DNA from the nuclei of African and Asian elephants, and from woolly mammoths and the American mastodon.
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 mastodon became extinct about 10, 000 years ago - around the same time that mammoths disappeared from most of their range.
猛犸应该不会与生活在北美洲和中美洲的另一种古象——美洲乳齿象相混淆（Mammutamericanum）。
The mammoths should not be confused with the American mastodon (Mammut americanum), another ancient elephant from North and Central America.
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。
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.
在北美洲生活着各种各样的巨兽，如猛犸象和乳齿象，都是长着巨大象牙的象状动物，还有骆驼和巨大的树懒，名单待续。
North America was populated by a wide variety of great beasts, like mammoth and mastodons, both elephant-like creatures with big tusks, and camels, giant sloths, the list goes on.
美洲印第安人的祖先大概知道乳齿象。
The ancestors of American Indians probably knew the mastodon.
北美洲的乳齿象；在一些分类中被当作猛犸而不是乳齿象。
North American mastodon; in some classifications considered a mammoth rather than a mastodon.
北美洲的乳齿象；在一些分类中被当作猛犸而不是乳齿象。
North American mastodon; in some classifications considered a mammoth rather than a mastodon.
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