By the time the cell has moved one-fiftieth of an inch upward from the dermal papilla, it is so choked with keratin fibers that it is no longer exchanging material with its environment.
12.
At its base, which in growing adult hair is about a sixth of an inch below the skin's surface, the hair shaft envelops a little upraised nubbin of connective tissue called the dermal papilla.
13.
In addition, research into what are called dermal papilla cells shows that these cells at the base of the hair follicle can be removed from a subject, multiplied in a laboratory, and then reinserted.
