Many Paths, Few Destinations: How Stem Cells Decide What They'll Be

It's usually assumed that stem cells differentiate via a set of "instructions" and prescribed pathways. However, new research shows that the decision is made collectively by an entire network of genes and proteins -- through a simple, elegant system that maintains cells in a stable state, yet enables them to differentiate as needed. It also suggests a more efficient way of differentiating stem cells in the lab.

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