Melanocyte stem cells exist within every hair follicle. These cells gradually split into two populations - 1 produces pigment for hair before dying, while the other becomes a new melanocyte stem cell. In a perfect world, these cells would replenish themselves indefinitely and we'd keep our original hair color (baldness notwithstanding).
Researchers think the melanocyte die-off may allow the body to shed potentially cancerous, radiation-stressed cells. Emotional Stress as a harm to stem cells is still up in the air - so don't blame your spouse just yet.
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