January 2009 in “Nihon Keshouhin Gijutsushakaishi/Journal of S C C./Nihon Keshouhin Gijutsushakai kaishi” Curved human hair has different structures on each side, which might cause its shape and is similar to wool.
January 1997 in “Han-guk hyeonmigyeong hakoeji/Applied microscopy” The hair follicle's connection to connective tissue is weaker than the skin's.
83 citations
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May 2011 in “Experimental Dermatology” Sheep have 17 keratin genes, similar to humans, but with different expression patterns affecting wool and hair.
28 citations
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July 2000 in “PubMed” Hair structure forms the same way inside and outside the body.
10 citations
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April 2007 in “PubMed” Coordinated gene activities are crucial for normal hair growth.
2 citations
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January 2015 in “Sen'i Gakkaishi” Washing permed hair after using thioglycolic acid helps reform strong bonds, making hair stronger.
A KRT32 gene variant causes loose anagen hair syndrome.
11 citations
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January 1989 Two patients had a unique form of trichothiodystrophy with reduced high-sulfur proteins in their hair.
122 citations
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January 2006 in “Molecular & Cellular Proteomics” Human hair contains many proteins, with some being highly abundant and modified.
49 citations
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June 2004 in “Philosophical Transactions of the Royal Society A Mathematical Physical and Engineering Sciences” Human hair becomes weaker and stretches more easily at higher temperatures.
41 citations
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July 2020 in “Colloids and surfaces. B, Biointerfaces” Different hair protein amounts change the strength of keratin/chitosan gels, useful for making predictable tissue engineering materials.
37 citations
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October 2015 in “PeerJ” Perming significantly changes hair's molecular structure, while shampoo and conditioner do not.
28 citations
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December 1997 in “Journal of Biological Chemistry” A genetic mutation in the hHa1 gene creates a smaller, but still functional, hair protein without causing hair problems.
19 citations
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May 2008 in “Applied spectroscopy” Human hair has different protein structures in its cuticle and cortex.
1 citations
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June 2014 in “[Thesis]. Manchester, UK: The University of Manchester; 2014.” Chemical modifications can alter hair's stability and flexibility, with hydrophobic interactions helping maintain structure in humid conditions.
March 2025 in “ACS Applied Materials & Interfaces” Ultrasonic microneedles improve hair regrowth treatment effectiveness without side effects.
Oxidized hair can naturally regain strength and stability over six months.
Chemical treatments weaken hair's thermal stability and structure.
13 citations
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April 1997 in “Biochemical and Biophysical Research Communications” Insulin-dependent diabetes alters hair's molecular structure, making it useful for studying diabetes effects.
75 citations
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August 2018 in “Plant physiology” Hydrogen sulfide disrupts protein function and root hair growth in plants by modifying proteins.
33 citations
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September 2017 in “Journal of Investigative Dermatology” A mutation in the KRT25 gene causes woolly hair and hair loss.
31 citations
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April 2004 in “Journal of Investigative Dermatology” A new mouse gene, Keratin 17n, is mainly found in nail tissue and may explain why mice without Keratin 17 don't have nail issues.
21 citations
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April 2014 in “PLoS ONE” A rare gene variant causes hair and nail issues in a family.
2 citations
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September 2020 in “Biomedical materials” Recombinant keratin materials may better promote skin cell differentiation than natural keratin.
1 citations
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January 2013 in “PubMed” Permanent wave treatment with thioglycolic acid changes hair structure by altering disulfide bonds.
51 citations
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September 2012 in “Biomacromolecules” Disulfide bonds make keratin in hair stronger and tougher.
46 citations
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June 2013 in “Journal of structural biology” High glycine–tyrosine keratin-associated proteins help make hair strong and maintain its shape.
72 citations
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July 2012 in “Journal of Investigative Dermatology” Mice lacking a key DNA methylation enzyme in skin cells have a lower chance of activating stem cells necessary for hair growth, leading to progressive hair loss.
40 citations
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September 2004 in “Biomacromolecules” The Glu413Lys mutation in keratin affects hair stability, while Glu413Asp does not.
1398 citations
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May 2008 in “Histochemistry and Cell Biology” Keratins are crucial for cell stability, wound healing, and cancer diagnosis.