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Aging May Not Be a Linear Process, Study on Reversible Stress-Induced...

A team led by scientists at the Columbia University Irving Medical Center overturn a recent animal model study, to show that stress-induced graying of human hair may be reversed upon elimination of the source of stress. In contrast to an earlier mouse study that showed a permanent loss of stem cells in hair follicles, the current study links a reversible change in the function of mitochondria to graying of hair on encountering a stressful phase in life.
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