In a finding that will pique the interest of the roughly 2% of the global population affected by alopecia, scientists have identified a “protective” protein — MCL-1 — that acts as a cellular guardian for hair follicle stem cells. Published in Nature Communications, the study reveals that when MCL-1 fails, stem cells self-destruct, halting new hair growth entirely. The discovery suggests hair loss may hinge on a delicate cellular balance during regeneration, opening a potential new pathway for treatment.
Walter Murrow
April 21, 2026
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