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A key aspect of hair loss with age is the aging of the hair follicle. [15] Ordinarily, hair follicle renewal is maintained by the stem cells associated with each follicle. Aging of the hair follicle appears to be primed by a sustained cellular response to the DNA damage that accumulates in renewing stem cells during aging. [16]
Androgenetic alopecia goes by many names: male pattern hair loss, female pattern baldness and about a dozen others. It affects everyone — men and women, young and old — and despite ...
DNA damage may trigger signalling pathways, such as apoptosis, that contribute to depletion of stem cell stocks. This has been observed in several cases of accelerated aging and may occur in normal aging too. [2] A key aspect of hair loss with age is the aging of the hair follicle. [47]
In 2012, scientists from the University of Pennsylvania School of Medicine published their own findings regarding hair cloning. [5] During their investigation, they found that non-bald and bald scalps have the same number of stem cells, but the progenitor cell number was significantly depleted in the case of the latter.
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Scalp hair was reported to grow between 0.6 cm and 3.36 cm per month. The growth rate of scalp hair somewhat depends on age (hair tends to grow more slowly with age), sex, and ethnicity. [3] Thicker hair (>60 μm) grows generally faster (11.4 mm per month) than thinner (20–30 μm) hair (7.6 mm per month). [4]
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