Hair might go gray when stem cells with wanderlust have their travels interrupted.
Stem cells involved in making the pigment that gives hair its color behave much differently than other stem cells do, researchers report April 19 in Nature. Rather than staying put, these melanocyte stem cells travel up and down hair follicles all while oscillating between two different forms of maturity. But it’s not the unusual behavior that leads to graying. It’s when these stem cells stop their quirky ways that hair turns white.
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