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。
The researchers say they have also done the first nuclear genetic analysis of the American mastodon.
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 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。
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