Hearts with more polyploid cells-like mice and humans-cannot.

像老鼠人类等拥有更多多倍体细胞的脏，则不能再生。

So what makes a heart have more polyploid cells, and thus, less chance of regenerating?

为什么脏拥有更多多倍体细胞，再生的几率少了呢？

But the lion's share of our heart cells are actually polyploid, meaning two or more copies from mom, two or more copies from dad.

但我们脏细胞的大部分是多倍体，也就是说从父亲或母亲处遗传到两套或两套以上的染色体。

But the lion's share of our heart cells are polyploid, meaning two or more copies from mom, two or more copies from dad.

但是我们脏细胞的最大份额是多倍体，这意味着妈妈有两个或更多拷贝， 爸爸有两个或更多拷贝。

What Huang and his team found, looking at that collection of hearts, is that the proportion of polyploid cells in a heart goes up as you go from fish to lizards to amphibians to transitional species like platypuses, to mammals.

黄他的团队发现， 通过观察脏的集合，脏中多倍体细胞的比例随着你从鱼类到蜥蜴到两栖动物到鸭嘴兽等过渡物种再到哺乳动物上升。