1 citations
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January 2018 in “Acta dermato-venereologica” A teenager's hair with alternating white and dark bands, known as Pili annulati, is a genetic condition that is usually harmless and often considered attractive.
1 citations
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January 2018 in “International Journal of Trichology” Circle hairs are harmless, spiral-shaped body hairs that don't need medical treatment.
5 citations
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March 2009 in “Pediatric Dermatology” The study found that pili bifurcati causes hair to intermittently split into two branches, each with its own outer layer.
April 2018 in “Journal of Investigative Dermatology” 29 citations
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January 2021 in “G3 Genes Genomes Genetics” A 195 bp duplication in the HOXC10 gene causes crests in domestic chickens.
9 citations
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January 1989 in “Journal of Small Animal Practice” Abyssinian cats can have a hair abnormality that makes their coat look rough and dull.
May 2020 in “International journal of dermatology and venereology” Hair matrix cysts are rare skin nodules with unique features, often needing surgical removal.
20 citations
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September 2004 in “Journal of Anatomy” The inner root sheath evolved to help hair grow safely through the skin in mammals.
4 citations
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July 2010 in “International Journal of Cosmetic Science” Curved human hair has different structures on its convex and concave sides.
July 2025 in “Communications Biology” Rat vibrissae structure relates to their sensory function.
6 citations
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July 2015 in “Journal of Investigative Dermatology” Chicken feather gene mutation helps understand human hair disorders.
January 2000 in “The Mouseion at the JAXlibrary (Jackson Laboratory)” The lanceolate hair-J mutation in mice helps understand human hair disorders like Netherton's syndrome.
8 citations
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October 2024 in “Developmental Cell” January 1996 in “Studia iuridica” Two new gene mutations cause a rare hair disorder.
6 citations
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August 2012 in “The Journal of Pediatrics” A 12-year-old girl was diagnosed with monilethrix, a genetic condition causing fragile, beaded hair that breaks easily, with no effective treatment available.
14 citations
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May 1979 in “International Journal of Dermatology” Trichostasis spinulosa mainly affects the nose, with many tiny hairs in one follicle, possibly influenced by hormones and sunlight.
7 citations
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January 1959 in “Canadian Journal of Chemistry” Human and horse hair have similar end groups to wool and feathers.
58 citations
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November 1969 in “British Journal of Dermatology” Netherton's disease causes multiple hair defects.
April 2024 in “The journal of investigative dermatology/Journal of investigative dermatology” ASH2L is essential for skin and hair development.
June 2010 in “Chinese Journal of Dermatology” A new gene mutation is linked to monilethrix in the studied family.
16 citations
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January 2005 in “The International Journal of Developmental Biology” Hex gene plays a crucial role in starting feather development in chick embryos.
7 citations
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May 1988 in “International Journal of Dermatology” The patient's hair has unique structural differences with alternating bright and dark bands.
10 citations
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November 2008 in “Veterinary Dermatology” The mouse hairy ears mutation causes longer ear hair due to changes in gene expression.
8 citations
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May 2005 in “The American journal of dermatopathology/American journal of dermatopathology” The hair defect is due to abnormal inner root sheath keratinization.
36 citations
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November 2019 in “Molecular biology and evolution” Cysteine-rich keratins evolved independently in mammals, reptiles, and birds for hard skin structures like hair, claws, and feathers.
March 2023 in “Asian Journal of Beauty and Cosmetology” HX109 herbal extract helps hair grow by boosting cell growth and reducing cell death.
22 citations
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June 2008 in “Experimental Dermatology” Heparanase is essential for hair follicle health and inner root sheath differentiation.
49 citations
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January 1972 in “Biochimica et Biophysica Acta (BBA) - Protein Structure” 3 citations
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July 1990 in “PubMed” Human hair follicles can grow and form structures in a collagen gel, useful for studying hair cell growth.
June 2017 in “Mechanisms of development” Hox genes control hair follicle stem cell regeneration in different body regions.