Hair follicles are the only organs that can completely regenerate throughout adulthood
Hair follicles are the only organs in the human body that can completely regenerate themselves multiple times throughout an individual's adult life.
Every hair follicle on the scalp undergoes a continuous cycle of growth (anagen), regression (catagen), and rest (telogen). During the transition between these phases, the follicle essentially destroys itself and then regrows from a reservoir of stem cells located in a region called the 'bulge.'
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