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.
通过对比找出人类基因中相同序列，就可以推测和相应的生物模型中的基因有类似的功能。
Computer comparison then shows which human genes correspond in DNA sequence and thus, presumably, in function, to the genes in these "model" organisms.
通过与公开的1500种细菌的参照序列进行对比，他们排除了人类DNA，并尽可能多地鉴定出其中的细菌种类。
By comparing the DNA sequences with publicly available reference sequences for 1500 bacterial and other species, they excluded all human DNA and identified as many bacteria as they could.
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