For Embryo's Cells, Size Can Determine Fate

For Embryo's Cells, Size Can Determine Fate
Gist Croft, Alessia Deglincerti, Ali H. Brivanlou/The Rockefelle

The developing embryo is a finely tuned machine. Its cells know what to do, and when to do it. They know to grow or shrink, to divide or lie dormant, to come together into a beating heart or hurtle through the bloodstream in search of a distant invader.

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