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January 2016 in “International review of cell and molecular biology” Cornification evolved from keratinization in vertebrates, with differences between mammals and sauropsids.
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August 2007 in “Annals of Anatomy - Anatomischer Anzeiger” Feathers become harder as they develop due to a change in keratin type.
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January 1999 in “Journal of Cutaneous Pathology” Spiny keratoderma may be ectopic hair formation on palms and soles.
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December 2018 in “Journal of cutaneous pathology” Some skin growths with mucin can form hair follicles and resemble skin cancer, but a special stain can help tell them apart.
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April 2017 in “European Journal of Cell Biology” CIP/KIP proteins help stop cell division and support hair growth.
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February 2016 in “Anatomical Science International” Hair proteins change location and structure as hair cells mature.
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July 2006 in “Journal of Investigative Dermatology” K25, K27, and K28 are found in all inner root sheath layers of hair, while K26 is only in the cuticle.