Giant axonal neuropathy changes the structure of keratin in human hair, making it stiffer and stronger.
July 2026 in “Journal of Investigative Dermatology” 17 citations
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November 1967 in “American Journal of Anatomy” Hairless mice have longer hair follicles and abnormal structures during the catagen phase.
1 citations
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July 2017 in “Skin appendage disorders” A 9-year-old Hispanic girl has Uncombable Hair Syndrome, which may improve with age and biotin treatment.
February 2023 in “Cosmoderma” Loose anagen hair syndrome causes easily shed hair but usually improves with time.
4 citations
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January 1981 in “PubMed” Hair medullary cells in mammals vary in complexity, with humans having more structured cells similar to inner root sheath cells.
7 citations
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April 2000 in “Mammalian Genome” A new mutation in mice causes crooked whiskers and messy hair.
Trichorrhexis nodosa causes hair to break easily, often affecting young to middle-aged black women.
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.
3 citations
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October 1994 in “Medical Molecular Morphology” The lower part of rat vibrissa hair gets more blood and is well-protected for growth.
19 citations
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July 2004 in “Australasian Journal of Dermatology” Her hair grew back normally after she stopped rubbing it.
28 citations
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March 2014 in “Biological reviews/Biological reviews of the Cambridge Philosophical Society” The document concludes that hair curvature can be explained by the growth patterns caused by the shape and separation of cells in the hair follicle and is affected by specific molecular pathways.
15 citations
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February 1999 in “The anatomical record” Some mutant mice have hair with abnormal cross-linking, mainly in the cuticle, not affecting other hair parts.
January 2014 in “Journal of the Korean Society of Design Culture” The study confirmed that changes in hair structure in women with hair loss conditions matched what is taught in beauty college trichology courses.
2 citations
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January 1990
November 2005 in “Nature Reviews Molecular Cell Biology” The protein hairless is important for hair regrowth because it stops the protein wise from blocking the hair cycle.
January 2005 in “Journal of Zhejiang University(Sciences Edition)” Yuyi hairless mice lose hair after birth, develop thick, loose skin with folds, and show disorganized skin structure as they age.
6 citations
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January 2000 in “Dermatology” A girl's severely tangled hair couldn't be fixed and had to be cut due to a rare condition called plica neuropathica.
40 citations
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May 2016 in “Proceedings of the National Academy of Sciences of the United States of America” Changes in keratin make hair follicles stiffer.
2 citations
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September 2004 in “International Journal of Cosmetic Science” Hair quality is genetically determined and linked to its composition and strength.
East and Southeast Asians typically have less dense but thicker, straight black hair.
May 2026 in “Research Square” The polyG fragment in Hoxc13 protein helps evolve mammalian skin and hair by enhancing gene interactions.
21 citations
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December 2011 in “Chungara” Mummy hair's chemical composition may not accurately show ancient people's health due to environmental contamination.
5 citations
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January 2009 in “International Journal of Trichology” Two siblings had a rare hair condition with banded hair, which doesn't need treatment.
November 2025 in “Archaeometry” Animal hair from 18th-century Mazamet burial sites shows locals used goat, badger, cow, or horse fur for clothing, indicating modest economic status.
December 2019 in “C&EN Global Enterprise” Thicker hair isn't always stronger.
A genetic variant in the KRT71 gene may cause loose anagen hair and wooly hair, and symptoms might improve with age.
27 citations
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March 2018 in “Journal of Experimental Biology” Wool fibre curvature is due to longer orthocortical cells compared to paracortical cells.
August 1989 in “Proceedings ... annual meeting, Electron Microscopy Society of America/Proceedings, annual meeting, Electron Microscopy Society of America” The research provided a detailed view of the non-keratinous parts of human hair fibers.
May 2023 in “Elsevier eBooks”