Transplants from balding and hairy androgenetic alopecia scalp regrow hair comparably well on immunodeficient mice
May 2003
in “Journal of The American Academy of Dermatology”

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 →
Cited in this study

research Possible mechanisms of miniaturization during androgenetic alopecia or pattern hair loss
Hair loss occurs due to fewer papillary cells, smaller follicles, and shorter growth phases.

research Finasteride in the treatment of men with androgenetic alopecia
Finasteride safely and effectively treats male pattern hair loss, but may cause reversible sexual issues and harm male fetuses.
research A controlled study of the effects of RU58841, a non-steroidal antiandrogen, on human hair production by balding scalp grafts maintained on testosterone-conditioned nude mice
Related

research Hair Restoration
Micrografts and minigrafts for hair restoration provide high patient satisfaction and can cover large areas of hair loss, including sideburns, eyebrows, and beards.

research Transplants from balding and hairy androgenetic alopecia scalp regrow hair comparably well on immunodeficient mice
Hair from balding and non-balding areas regrows similarly on mice.