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Glossary Cortical Cells

specialized hair cells providing strength, color, and texture

Cortical cells are specialized cells found in the cortex of the hair shaft, which is the thickest layer of the hair. These cells are responsible for providing strength, color, and texture to the hair by containing keratin and melanin. For professionals, understanding the structure and function of cortical cells is crucial for diagnosing and treating hair disorders such as alopecia.

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Research

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Acidic and Basic Hair/Nail (Hard) Keratins: Their Colocalization in Upper Cortical and Cuticle Cells of the Human Hair Follicle and Their Relationship to Soft Keratins

research Acidic and basic hair/nail ("hard") keratins: their colocalization in upper cortical and cuticle cells of the human hair follicle and their relationship to "soft" keratins.

356 citations , December 1986 in “The journal of cell biology/The Journal of cell biology”

This study found that specific human hair keratins are differentially expressed in the hair follicle, suggesting a shared pathway of epithelial differentiation between hair cortex and nail plate cells.

research Stiffness of Human Hair Correlates with the Fractions of Cortical Cell Types

4 citations , April 2019 in “Cosmetics”

In this study, the bending stiffness of human hair was linked to the varying proportions of para-like versus ortho-like cortical cells within the hair fiber.

research Upcycling waste hair and feathers derived keratin into intact cortical cell-derived micro-units via periodate oxidation: Applications & life cycle assessment

February 2026 in “International Journal of Biological Macromolecules”

In this study, researchers developed a novel periodate oxidation method for extracting keratin micro-units from waste hair and feathers, achieving yields of 31.28% and 20.64% respectively, enhancing the stability of oil-in-water emulsions and suggesting potential for sustainable biomaterial production.

research Cortical cell types and intermediate filament arrangements correlate with fiber curvature in Japanese human hair

62 citations , December 2008 in “Journal of structural biology”

This study found that in naturally curved human scalp hairs, distinct arrangements of cell types on either side of the hair fiber contribute to its curvature.

research Protein-phosphatase inhibitors block root hair growth and alter cortical cell shape of Arabidopsis roots

61 citations , December 1994 in “Planta”

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community Is this true? It can be a major breakthrough

1008 upvotes 5 months ago

Deoxyribose sugar gel may stimulate hair regrowth similarly to minoxidil by enhancing blood supply and follicle activity. Human trials are necessary, and current products have mixed results.

community Does someone like Prince William have such intense balding genetics that not even Dutasteride can save them?

in Chat 113 upvotes 1 year ago

Some men have strong balding genetics that treatments like Dutasteride, Minoxidil, or Finasteride may not fully address. Early intervention is believed to help, but many accept hair loss without treatment.

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