来自《耶鲁大学开放课程：生物医学工程探索 第5集 第5集》
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What I want you to remember now is that这节课我希望你能记住 -
abundant cell proliferation takes place during development.发育过程中伴有大量的细胞增殖过程 -
All of the cells that are reproduced during development所有在发育过程中繁殖的细胞 -
are the same in certain ways,在某些方面都是一样的 -
they contain the same DNA,它们都有相同的DNA -
they're all progeny of the same fertilized egg,都是同一个受精卵的后代 -
but differences are acquired within specific cell populations但是分化是在特定细胞类群 -
during the process of development.发育过程中必不可少的 -
Some of those differences in cells are obvious你留心观察某个成年的生物 -
if you look at the cells in an adult organism.就会发现某些细胞分化极其明显 -
In fact,事实上 -
some cells are very different from the cells某些细胞同发育早期所增殖的细胞