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      research Replenishing amino acids in damaged hair

      March 2005 in “Journal of the American Academy of Dermatology”
      This study found that reintroducing certain depleted amino acids into weathered hair using cosmetic treatments can strengthen the hair, improving its look and feel and reducing damage and breakage.

      research Regulation of Keratin Gene Expression in Hair Follicle Differentiationa

      98 citations , December 1991 in “Annals of the New York Academy of Sciences”
      This study found that conserved DNA motifs and expression patterns in keratin genes suggest functional regulatory similarities in hair follicle differentiation across different mammalian species.
      Tactile Innervation Densities Across the Whole Body

      research Tactile innervation densities across the whole body

      4 citations , April 2020 in “bioRxiv (Cold Spring Harbor Laboratory)”
      This study estimates that approximately 230,000 tactile afferent fibers innervate the human body's skin, with varying densities across different regions correlating with spatial acuity and hair follicle density.
      Tactile Innervation Densities Across the Whole Body

      research Tactile innervation densities across the whole body

      142 citations , September 2020 in “Journal of neurophysiology”
      This study estimates that young adults have about 230,000 tactile afferent fibers innervating their skin, with density varying by region and decreasing with age.

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