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This study observed defects in hair cuticle cross-linking in some, but not all, mouse mutants with sparse or structurally unsound hair.

This study found that hair germ and epidermal basal cells differ in keratin expressions in rat hair tissues, with hair-specific keratins appearing after the differentiation of each layer.

This microscopy study examined the non-keratinous regions of human hair fibers, revealing detailed morphology that could help understand how external influences affect hair structure.

This study describes a staining technique that differentiates medullary from cortical keratin in sheep and goat hair using Ziehl-Neelsen's carbol-fuchsin in skin biopsy sections.

This study found that pubic hair from Korean males has a thicker cuticle layer with more scales compared to scalp hair, offering better protection against chemical damage, and hypothesizes this evolved as a defense mechanism against exposure to urine and ammonia.

This study compared the effects of three compounds on structural and sensory benefits for bleached hair when applied with or after bleaching, observing that their application may mitigate bleaching-induced damage.

In this study, significant changes in hair fiber dimensions were observed between pre- and post-operative states in males undergoing abdominal surgery, with values normalizing by the fourth post-operative week.

This study observed that long-term UV-A exposure and semi-permanent dye treatment can cause significant structural damage to human hair, particularly affecting the cuticle and cortex layers.

This study found that both epithelial and hair keratins are expressed in beard hair medulla cells, exhibiting unique patterns and interactions distinct from other hair follicle and epithelial cells.

This study reports that prolonged UV irradiation causes progressive damage to the hair's keratin structure, leading to increased surface roughness, cuticle destruction, and decreased tensile strength in young women’s hair.

In this study, eight healthy dogs showed hair and skin damage, including hair shaft fractures and skin irritation, after repeated application of Clairol Hair Dye Flaxen Blonde.

This study cataloged human type II hair keratins, detailing their expression and differentiation roles in hair follicles and comparing them with type I keratins to explore keratin-pairing principles.

Different keratin proteins are expressed in various epithelial cells at different stages, affecting cell structure and function.

This study found that serum DHEA levels increase earlier and are higher in girls compared to boys through various stages of puberty, reflecting their earlier pubertal development.

Mice with extra sheep genes had hair that fell out and regrew in cycles.

This review discusses various types of hair dyes, their mechanisms of action, molecular structures, application methods, and formulation aspects, but reports no new research findings.

K39 and K40 are the last keratins expressed in hair development, completing the hair keratin catalog.

This study observed that calcifying epithelioma of Malherbe is composed of tumor cells that differentiate into both hair cortex and outer root sheath, supporting its hair follicle origin.

This review discusses how various factors, including cosmetic procedures and scalp conditions, can damage hair, but highlights the availability of products to improve hair health; it reports no new empirical results.

This article reviews common endocrine neoplasms in domestic ferrets and discusses diagnosis and medical treatment options, reporting no new research findings.

This study found that trichothiodystrophic hair shows reduced and disoriented protein deposition in follicles, with both the cuticle and cortex affected, providing localized structural insights into keratin abnormalities.

This study visualized mitochondrial metabolism in cultured bovine hair follicles and plucked human hairs, finding that ROS and mitochondrial polarization correlate in specific hair follicle regions, particularly near keratin deposition sites.

This study found that the S100A3 gene is exclusively expressed in hair follicle cells differentiating into hair shaft components in mice, suggesting its important role in hair formation.

This study found that Krtap11-1 may play an important role in keratin-bundle assembly in the hair cortex, influencing the physical properties of hair.

This study observed that dietary intake of glucoraphanin during juvenile and adolescent stages prevented cognitive deficits and abnormal gene expressions in the brain of adult offspring exposed to maternal immune activation, potentially implicating centrosome-related genes in the development of psychosis.

Pili annulati is caused by a protein metabolism disorder affecting hair structure.

This review discusses the current understanding of androgen biosynthesis, mechanisms of action, and their roles in human biology, as well as related congenital and acquired disorders, but it reports no new research findings.

This study found that transcription factors HOXC13, LEF1, and FOXN1 repress DSG4 transcription, with the Notch pathway possibly involved in maintaining DSG4 expression in hair follicles.

This study observed that the thinning and structural abnormalities in monilethrix-affected hair occur at the internodes due to possible periodic dysfunction of the hair matrix, particularly in the cortex.

This study examined developing hair cortex with electron microscopy and found that keratin fibrils form between specific regions in hair follicles and aggregate into twisted cables.