Micro-RNAs keep stem cells from growing up too fast

There comes a point in every cell's life when it has to decide what it wants to be when it grows up. Young cells, so-called stem cells, take their clues to their future career primarily from the environment they find themselves in. But in a new embryo, that environment is constantly in flux; how does a cell know how long to wait before it makes an irrevocable choice?

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