Patterns of Hair Loss in Men

That is fascinating but it prompts a few thoughts. Why not use body hair for transplant processes? And why does the balding gene only impact on the top of the head and not the sides?

The sides of the hairline, as well as the 3 inch section at the bottom of the back of the head, is immune from genetic hair loss. Body hair can be used for hair transplants but it has a short growing cycle so if you transplant 100 body hairs, only half will be growing at any one time while the others are in the telogen (sleep) phase. This means that you generally only receive half the value when body hair is transplanted compared to scalp hair.