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January 1979 in “International review of cytology” Wool follicles are complex, involving interactions between different cell types and structures.
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May 1991 in “The journal of investigative dermatology/Journal of investigative dermatology” Trichohyalin is also found in the outer layers of normal human skin.
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June 2014 in “Journal of developmental biology” Retinoic acid helps change skin cells and is important for skin development and hair growth.
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May 2002 in “The American journal of pathology” Cathepsin L is essential for normal hair growth and development.
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January 2006 in “Molecular & Cellular Proteomics” Human hair contains many proteins, with some being highly abundant and modified.