The biology of hair follicles.

@article{Paus1999TheBO,
  title={The biology of hair follicles.},
  author={Ralf Paus and George Cotsarelis},
  journal={The New England journal of medicine},
  year={1999},
  volume={341 7},
  pages={
          491-7
        }
}
Hair has many useful biologic functions, including protection from the elements and dispersion of sweat-gland products (e.g., pheromones). It also has psychosocial importance in our society, and patients with hair loss (alopecia) (Table 1) or excessive hair growth often suffer tremendously. Not surprisingly, the demand for drugs that alter hair growth and appearance has led to a multibillion-dollar industry, yet few drugs that are effective for these purposes are available. However, recent… 

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...

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...