And how do they fit into the mammal family tree?

它们如何融入哺乳动物的家谱？

ADH7 has lost its function in 10 separate spots on the mammal family tree, they found.

他们发现， ADH7 在哺乳动物家族树上的 10 个不同位置失去了功能。

To figure out where bats truly fit in the mammal family tree, paleontologists have teamed up with geneticists to study the DNA of living bats.

为了找出蝙蝠真正适合哺乳动物家谱的位置，古生物学家与遗传学家合作研究活蝙蝠的 DNA。

So  they compared the proteins from the two South American ungulates to those from a range of 76  other mammals from across the mammal family tree.

因此，他们将两种南美有蹄类动物的蛋白质与哺乳动物家族树中 76 种其他哺乳动物的蛋白质进行了比较。

The playtpus belongs to an unusual group called monotremes that diverged from the branch of the mammal family tree that leads to marsupials -- and later placentals -- around 186 million years ago.

playtpus 属于一个不寻常的类群，称为单孔类动物，大约在 1.86 亿年前，它从导致有袋类动物和后来的胎盘类动物的哺乳动物家族树的分支中分离出来。