"Detecting hair follicle stem cells (Courtesy of Stanca Birlea, MD and David Norris, MD):  A cross-section through a human hair follicle revealing the location of multipotent stem cells (green) in a region called ""the bulge"" which is located just above the site of insertion of the arrector pili muscle (red).  Multipotent stem cells renew hair follicles, sebaceous glands and the epidermis in response to injury.  The bulge is also the location of melanocyte stem cells which can be mobilized to repigment the skin of patients who suffer from vitiligo."
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