In the second link, Lee Buckler, President and CEO of RepliCel.
"In androgenic alopecia, the androgen hormone kills off one of the cell populations in the hair follicle that’s responsible for hair growth. They’re called the dermal sheath cup cells and sit at the base of the hair follicle. The androgen hormone attaches to a cell receptor on the surface of those cells. That same cell population located at the back of the head simply lacks the receptor for the androgen hormones to use in its attachment."
Are different scalp hairs depending where are they located? at sides the hair lacks the receptor for androgen hormones? I don't beleive it in healthy scal hairs, even in the sides.
I thought this was the generally accepted understanding for the last 20 years. They probably don't have zero receptors, but far less than those on the crown and the temples.
