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

为什么心脏拥有更多多倍体细胞，再生的几率反而减少了呢？

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.

黄和他的团队发现， 通过观察心脏的集合，心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而上升。