788 citations
,
  February 2007   in “Nature”    The document concludes that skin stem cells are important for hair growth and wound healing, and could be used in regenerative medicine.  
     
           185 citations
,
  December 2011   in “Molecular and cellular endocrinology”    Skin cells produce and activate vitamin D, which regulates skin functions and supports hair growth.  
     
           158 citations
,
  August 2011   in “Reviews in endocrine and metabolic disorders”    Vitamin D and its receptor regulate skin functions like cell growth, immunity, hair cycle, and tumor prevention.  
     
           72 citations
,
  November 2012   in “PloS one”    The protein folliculin, involved in a rare disease, works with another protein to control how cells stick together and their organization, and changes in this interaction can lead to disease symptoms.  
               70 citations
,
  January 2014   in “International review of cell and molecular biology”    Keratin proteins are crucial for healthy skin, but mutations can cause skin disorders with no effective treatments yet.