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Gray hair might be more than a sign of aging — it could be your body’s defense against skin cancer. In this 59s Short we unpack a University of Tokyo study (Nature Cell Biology) showing melanocyte stem cells (McSCs) face two fates after DNA damage: irreversible senescence-associated differentiation (they “retire,” stop dividing, and cause gray hair) or dangerous clonal spread triggered by carcinogens like UV‑B and harsh chemicals that raises melanoma risk. Clear, punchy narration, modern progressive music, and a shock-to-clarity hook make complex science easy to grasp. Learn how gray hair relates to cancer prevention — and why failure of this pathway can lead to melanomagenesis. Like & share if you found this eye-opening. #GrayHair #Melanoma #McSC #SkinCancer #ScienceShorts #UniversityOfTokyo