Simple Gene Circuits Hint at How Stem Cells Find New Identities

The human body contains more than 200 types of cells by most estimates, all descended from a single fertilized egg. The spindly cells of the skin, the gangly branching neurons, the plump fat cells, the exquisitely sensitive rods and cones of the eye — all of these are products of a long process of development, during which their physical forms altered beyond recognition. With few exceptions…

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