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September 2004 in “Journal of Anatomy” The inner root sheath evolved to help hair grow safely through the skin in mammals.
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February 2015 in “Experimental Dermatology” Cells from the base of hair follicles help blood vessel cells survive and grow, which is important for healthy hair.
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March 2011 in “Stem Cell Reviews and Reports” Human epidermal neural crest stem cells can become bone and skin pigment cells, making them useful for therapies.
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June 2018 in “Proceedings of the National Academy of Sciences of the United States of America” Light can turn on hair growth cells through a nerve path starting in the eyes.
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March 2020 in “Cell and Tissue Banking” Injected cells show potential for hair growth.
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November 2004 in “Brain Behavior and Immunity” Stress increases nerve fibers and immune cell activity in mouse skin, possibly worsening skin conditions.
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May 2005 in “Stem Cells” Mouse skin has special cells in the epidermis that decrease with age and are linked to keratinocyte stem cells.
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December 2020 The interdigital gland in crossbred sheep is similar to skin and has specialized structures for secretion.
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February 2016 in “Anatomical Science International” Hair proteins change location and structure as hair cells mature.
October 2025 in “Journal of Investigative Dermatology” Hair follicle dermal stem cells help control hair growth timing by regulating signals at the hair germ–dermal papilla interface.
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July 2020 in “Cell” Muscles and nerves that cause goosebumps also help control hair growth.
Transplanted rat hair follicles grew hair and had increased but not fully restored nerve connections in mice.
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September 2013 in “Tissue engineering. Part A” Hair follicle stem cells can become motor neurons and reduce muscle loss after nerve injury.
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October 2005 in “Molecular and cellular endocrinology” Hair melanocytes help the skin respond to stress and regulate hair pigmentation.