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June 2024 in “Drug Testing and Analysis” Nails could be used to check long-term drug use, but more research is needed.
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December 1992 in “British Journal of Dermatology” Rat hair follicles grow longer in vitro, but certain factors can inhibit this growth.
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December 1994 in “British Journal of Dermatology” Sheep dermal papillae can help form hair follicles in skin models.
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November 2005 in “The journal of investigative dermatology. Symposium proceedings/The Journal of investigative dermatology symposium proceedings” The lipid in human hair follicles acts as a barrier, similar to the skin's lipid layer.
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May 2008 in “Applied surface science” Mummy hair from the Taklamakan desert has calcium and phosphorus inside.
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June 2010 in “Medicina de Familia SEMERGEN” The girl's "dandruff" was actually harmless hair casts, not a hygiene issue.
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August 2023 in “Journal of cutaneous pathology” The analysis of a large pilomatricoma revealed five distinct areas with different gene activity related to hair growth and tumor development.
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December 2021 in “Kathmandu University medical journal” Adult earlobe can have a benign cyst that is usually removed by surgery.