December 2025 in “Biology Bulletin Reviews” Hair cortisol can indicate animal stress but varies with many factors.
November 2023 in “International journal of reproduction, contraception, obstetrics and gynecology” Polycystic ovary syndrome causes high male hormone levels, leading to symptoms like excess hair, acne, and fertility problems.
September 2021 in “Research Square (Research Square)” Not having enough or having too much of the protein Grainyhead-like 3 leads to various developmental problems.
1 citations
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October 2012 in “The Journal of Dermatology” A Korean girl developed kinky hair without known cause or effective treatment.
173 citations
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May 2001 in “Human reproduction update” Oestrogens are key for bone growth during puberty in both boys and girls.
24 citations
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November 2015 in “Scientific reports” Human hair has a new region with ordered filaments and the cuticle contains β-keratin sheets.
12 citations
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June 2009 in “Journal of Cosmetic Dermatology” Loose Anagen Hair syndrome occurs in dark-skinned children and often improves on its own.
January 2026 in “Dermatology and Therapy” Poor sleep may lead to hair loss, and hair loss may affect sleep.
November 2025 in “Communications Biology” Human hair contains many different molecules that change along its length, influenced by personal care products.
September 2014 in “Springer eBooks” Men and women experience skin aging differently due to changes in sex hormone levels with age.
21 citations
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April 1990 in “Journal of comparative neurology” The study found that nerve signals are stronger when there are more connection points, but not necessarily denser, along the nerve's path in the spine.
161 citations
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July 2003 in “ACM Transactions on Graphics” Researchers developed a new model for more realistic computer graphics rendering of hair by considering how light scatters on hair fibers.
96 citations
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February 2007 in “The Journal of Clinical Endocrinology & Metabolism” Women with type 1 diabetes often have polycystic ovary syndrome and excess male hormones, which are frequently undiagnosed.
Researchers developed a new model for more realistic computer graphics of hair by considering how light scatters on hair fibers.
71 citations
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January 2019 in “International journal of biological sciences” Exosomes from dermal papilla cells help hair growth by making hair follicle stem cells multiply and change.
62 citations
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April 2013 in “Steroids” PCOS symptoms change with age; younger women have higher androgen levels and less metabolic issues, while older women face more metabolic challenges despite milder PCOS symptoms.
34 citations
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October 1982 in “Journal of applied polymer science” Moisture content significantly affects how human hair breaks.
13 citations
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September 2021 in “Communications Biology” Co5M offers a new way to observe and understand wound healing without labels.
January 2026 in “Frontiers in Molecular Biosciences” A new method helps diagnose alopecia areata using specific gene markers and could guide targeted treatments.
March 2014 in “Journal of The American Academy of Dermatology” Reflectance confocal microscopy can noninvasively diagnose onychomatricoma by showing unique features different from healthy nails or nail fungus.
January 2010 in “Yearbook of Endocrinology” Older men with lower levels of available testosterone are more likely to be frail.
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.
260 citations
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June 2011 in “Cell” Wnt signaling is crucial for pigmented hair regeneration by controlling stem cell activation and differentiation.
February 2024 in “Psychoneuroendocrinology” Mothers with lower stress during pregnancy but higher stress after birth had infants with lower development scores.
22 citations
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June 2010 in “Experimental Dermatology” Lower MC2R expression may contribute to alopecia areata.
6 citations
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May 2022 in “Frontiers in Medicine” The study suggests pandemic stress might worsen or trigger hair loss problems.
February 2024 in “Cureus” A large scalp tumor was removed from an elderly woman, who was later diagnosed with schizophrenia.
Activin A and follistatin control when ear hair cells form in mice.
296 citations
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October 2018 in “General and Comparative Endocrinology” Hair cortisol is a reliable way to measure long-term stress in animals.
55 citations
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August 2003 in “Ultrasound in Obstetrics and Gynecology” Ultrasound and color Doppler can help diagnose and decide treatment for early puberty in young girls.