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December 2018 in “International Journal of Cosmetic Science” CARB is a strong barrier in human hair that prevents dye penetration.
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June 1998 in “Journal of Forestry Research” Mammalian hair scales change from smooth to wavy due to friction.
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July 2015 in “PLoS ONE” The study revealed the detailed structure of a keratin dimer, aiding understanding of how intermediate filament proteins function.
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October 2017 in “ecancermedicalscience” Breast cancer alters specific molecular structures in hair, which revert after cancer removal.
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February 2013 in “Journal of Investigative Dermatology” Touch domes in human skin are complex sensory structures not directly linked to hair.
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January 2006 in “Journal of Structural Biology” Hair follicles form hard α-keratin filaments in four steps, showing structural differences.
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May 2010 in “Pigment Cell & Melanoma Research” Two genes, Tabby and Ticked, determine cat coat patterns.
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January 2010 in “The anatomical record” Most dogs have hair whorls on their chest and limbs, with shelter dogs and short-haired dogs having more chest whorls.
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November 2020 in “bioRxiv (Cold Spring Harbor Laboratory)” Gene expression, especially Dkk4, is key to cat color patterns.
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March 1993 in “International Journal of Oncology” Basal cell carcinoma shows keratin patterns similar to hair follicle structures.
February 2013 in “Journal of the American Academy of Dermatology” Uncombable hair syndrome causes dry, frizzy hair that can't be combed flat, seen in a young child.
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January 2014 in “Indian Journal of Dermatology, Venereology and Leprology” The 'Swiss cheese' pattern in scalp biopsies can indicate trichotillomania, not just alopecia areata.
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September 2018 in “Journal of Structural Biology” Oxidized trichocyte keratin has a helical dislocation in its structure.
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March 2011 in “PLoS Biology” Birds can lose neck feathers due to a genetic change that increases a gene's activity, helping them adapt to heat.
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June 2018 in “Journal of the American Academy of Dermatology” The document suggests finding a simpler, cheaper way to diagnose Uncombable Hair Syndrome.
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January 1998 in “Dermatology” Polythelia pilosa is a type of extra breast tissue with hair and should be classified as such.
December 2025 in “International Journal of Advanced Biochemistry Research” Malvi cattle hair varies in color and pattern across different body regions.
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April 2019 in “Journal of structural biology” Hair's internal fibers are arranged in a pattern that doesn't let much water in, and treatments like oils and heat change how much water hair can absorb.
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October 2022 in “Dermatology practical & conceptual” Isolated patchy heterochromia with pili annulati can occur without other health issues.
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May 2006 in “Journal of Structural Biology” Hair curliness is due to uneven distribution of different cortices within the hair fiber.
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