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March 2003 in “PubMed” The scalp has a natural speckled pattern of increased pigment around hair follicles, possibly linked to local hormone production.
As people age, certain enzymes in scalp glands decrease, affecting hair health.
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April 1993 in “PubMed” Human hair cells can change based on their environment, especially interactions with certain skin cells.
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April 1985 in “Canadian Journal of Zoology” Moose have unique interdigital glands with green hairs and larger glands during mating season.
January 2019 in “Social Science Research Network” Hair follicle stem cells prevent melanocyte stem cells from differentiating by controlling retinoic acid levels.
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April 1992 in “Differentiation” Sciellin is a protein that helps form protective layers in skin, hair, and nails.
May 2000 in “Journal of Investigative Dermatology” Hedgehog signaling is crucial for hair development, cadherins affect cell adhesion, neutrophils play a role in skin lesions, and BP230 autoantibodies impact skin stability.
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November 2020 in “Nature Communications” Adult stem cells with Tp63 can form hair and skin cells when placed in new skin, showing they have hidden abilities for skin repair.
April 2019 in “Journal of Investigative Dermatology” Increasing COX-2 in mouse skin causes bigger sebaceous glands and thinner hair, but stopping COX-2 can reverse hair thinning.
December 2023 in “bioRxiv (Cold Spring Harbor Laboratory)” Aged individuals heal wounds less effectively due to specific immune cell issues.
April 2025 in “bioRxiv (Cold Spring Harbor Laboratory)” Older mice heal wounds without scars due to special fibroblasts.
September 2017 in “Journal of Investigative Dermatology” Hair follicle cells change their DNA packaging during growth cycles and when grown in the lab.
October 2012 in “Faculty Opinions – Post-Publication Peer Review of the Biomedical Literature” Scientists used a special imaging technique to observe that hair follicle regeneration involves cell division and structural changes, mostly in the lower part of the follicle, and that the dermal papilla at the base is crucial for regrowth.
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April 1996 in “Journal of histochemistry and cytochemistry/The journal of histochemistry and cytochemistry” TGF-alpha is present in sheep and ferret skin and may affect hair growth without directly stimulating cell proliferation.
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December 2014 in “PLoS Biology” Macrophages help activate hair follicle stem cells, affecting hair growth and skin repair.
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December 2013 in “PLoS ONE” The postnatal thymus has cells like mesenchymal stem cells that can become different cell types and help maintain thymus structure.
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September 2009 in “Acta Ophthalmologica” Hyper-keratinisation in Meibomian glands contributes to gland dysfunction.
January 2009 in “Hubei nongye kexue” Stem cells in cashmere goats are found in hair follicles and have a slow growth rate.
June 2021 in “bioRxiv (Cold Spring Harbor Laboratory)” The gene Tfap2b is essential for creating a type of stem cell in zebrafish that can become different pigment cells.
January 2022 in “Clinical Cases in Dermatology” A man has a common skin condition called seborrheic dermatitis, treated with special shampoos and sometimes medication.
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February 2000 in “Journal of Investigative Dermatology” Stem cells in developing hair follicles move to specific areas as they mature.
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September 1992 in “Archives of Dermatological Research” Cepharanthine and minoxidil promote cell growth and delay hair cell maturation.
Senescence and genomic instability in fibroblasts contribute to hair loss and impaired skin regeneration with age.
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March 2002 in “The Journal of Dermatology” Steatocystoma multiplex is a skin condition starting around age 26, linked to hair follicles, and related to eruptive vellus hair cysts.
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January 2013 in “Applied and Environmental Microbiology” A gene in Sebekia benihana, CYP-sb21, is needed for a specific reaction on the drug Cyclosporine A, which could be important for hair growth without affecting the immune system.
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May 2023 in “Experimental dermatology” New imaging techniques can assess and track changes in mouse acne without harm, aiding treatment choices.
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December 1992 in “Seminars in cell biology” Skin stem cells are maintained by signals from nearby cells and vary in their ability to renew and mature.
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April 1982 in “Journal of the American Academy of Dermatology” Isotretinoin shrinks sebaceous glands without affecting hair or skin color, unlike etretinate.
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October 2021 in “bioRxiv (Cold Spring Harbor Laboratory)” G2 stem cells control calcium signaling for skin regeneration.