45 citations,
January 2012 in “Experimental Dermatology” Human hair follicles switch between active and resting phases unpredictably.
260 citations,
June 2011 in “Cell” Wnt signaling is crucial for pigmented hair regeneration by controlling stem cell activation and differentiation.
127 citations,
November 2010 in “Pigment cell & melanoma research” We need more research on human hair follicle pigmentation, not just mouse models.
13 citations,
October 2010 in “Methods in molecular biology” Hair follicle culture helps study cell interactions and effects of substances on tissue growth.
49 citations,
April 2010 in “International Journal of Cosmetic Science” 
75 citations,
January 2009 in “International journal of trichology” Hair grays due to oxidative stress and fewer functioning melanocytes.
210 citations,
May 2006 in “The FASEB journal” Oxidative stress causes hair to gray by damaging and killing pigment cells.
43 citations,
October 2005 in “Molecular and cellular endocrinology” Hair melanocytes help the skin respond to stress and regulate hair pigmentation.
450 citations,
January 2005 in “The journal of investigative dermatology/Journal of investigative dermatology” Hair color is determined by melanin produced and transferred in hair follicles.
86 citations,
August 2000 in “Pigment cell research” Melanocyte activity in hair follicles is linked to the hair growth cycle, being active in growth phases and inactive in rest phases.
130 citations,
December 1998 in “The journal of investigative dermatology/Journal of investigative dermatology” Hair follicle melanocytes die during hair regression.
161 citations,
June 1994 in “The journal of investigative dermatology/Journal of investigative dermatology” Hair stops producing melanin as it transitions from the growth phase to the resting phase.
