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In mammals, trichocytes are the specialized epithelial cells from which the highly mechanically resilient tissues hair and nails are formed. They can be identified by the fact that they express "hard", "trichocyte" or "hair" keratin proteins[1]. These are modified keratins containing large amounts of the amino acid cysteine, which facilitates chemical cross-linking of these proteins to form the tough material from which hair and nail is composed. These cells give rise to non-hair non-keratinized IRSC (inner root sheath cell) as well.


  1. ^ Langbein L, Schweizer J (2005). "Keratins of the human hair follicle". Int Rev Cytol. 243: 1–78. doi:10.1016/S0074-7696(05)43001-6. PMID 15797458.  


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