TLDR Hair from balding and non-balding areas regrows similarly on mice.
A study from 20 years ago found that hair follicles from both balding and non-balding areas of the scalp have the potential to regenerate quickly once removed from the human scalp and transplanted onto immunodeficient mice. The study suggests that hair follicles from balding scalps can still be used for hair transplantation. The study also found that the mouse environment is less than optimal for the growth of follicles originating from hairy scalp, with the rate of increase in length of these hairs appearing to be close to normal or only slightly diminished, but the mean diameter is markedly reduced.View this study on jaad.org →
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Hair from balding and non-balding areas regrows similarly on mice.