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This study found that different types of seborrheic keratosis demonstrate diverse differentiation patterns, highlighting its undifferentiated and hyperproliferative state with varying keratinization directions.

This study suggests that pilomatricoma can differentiate towards various hair follicle structures, including hair matrix, hair cortex, follicular infundibulum, outer root sheath, and hair bulge.

This review summarizes the cell type distribution and functional significance of human keratins, emphasizing their roles in tumor diagnosis and potential clinical applications, and reports no new clinical findings.

This study investigated pilomatrixoma, a benign skin tumor, and found that irregular expression of β-catenin and Lef-1 in transitional cells may contribute to amorphous debris and cyst formation.

This case report describes a 22-year-old woman with a nevoid plaque termed localized follicular hamartoma, characterized by skin-colored papules and specific cellular and structural features.

This article reports a case of late onset linear and unilateral basaloid follicular hamartoma in an elderly male, highlighting the clinical presentation, histopathological findings, and planned treatment approach.

This study suggests that keratin expression in keratoacanthomas resembles that in the upper part of hair follicles, implying a potential origin, but it is indistinguishable from squamous cell carcinomas in terms of keratin reactivity.

Mouse tail skin has different keratinization near hair follicles and scales.

Feathers become harder as they develop due to a change in keratin type.

This study describes trichilemmal keratinization as a distinct process of hair follicle keratinization that occurs in specific areas of the outer root sheath, illustrated using electron microscopy on dog hair.

This study identified distinct gene expression programs in keratinocytes responsible for forming hard scales and soft interscale epidermis in chickens, revealing conserved differentiation genes similar to those in human skin.

This study suggests that keratoacanthomas may be distinguished from squamous cell carcinoma by identifying hair follicle structures, based on keratin expression and histological features observed in tumor samples.

This paper reviews keratoacanthoma as a tumor that resembles but rarely progresses to squamous cell carcinoma, detailing its stages, potential origins, and distinguishing features from other similar growths, without reporting new clinical results.

This study found that keratin filament networks in SG1 cells of mice undergo dynamic changes during cornification, impacting the barrier function of the stratum corneum.

This study identified that keratotic basal cell carcinomas with citrulline-positive keratin and hair papilla-like structures are highly differentiated, which helps distinguish them from squamous carcinomas.

This case report describes a proliferating trichilemmal cyst that underwent malignant transformation, with specific keratins identified in the tumor but no epidermal keratin detected.

Vertebrate skin evolved to be more specialized and complex, especially in land animals.

This study suggests that spiny keratoderma may be an ectopic hair formation on palms and soles, based on keratinization patterns observed using antikeratin antibodies and electron microscopy.

This study seeks to clarify the terminology and classification of keratoacanthoma and similar squamous cell carcinoma lesions with central keratin-filled craters to aid in accurate differential diagnosis.

This study suggests that immunostaining for Keratin 15 may be a useful tool for differentiating between basal cell carcinoma and trichoepithelioma.

This study found that the keratin expression in basal cell carcinoma resembles that of the pilosebaceous apparatus, with uniform presence of certain keratins in all cases.

This study identified a new 65 kD and 48 kD keratin pair expressed in specific mouse epithelial sites, suggesting a unique evolutionary branch of hair-related keratins.

Cornification evolved from keratinization in vertebrates, with differences between mammals and sauropsids.

This study found that seborrheic keratosis lesions contain high levels of hair sheath keratin, suggesting they may originate from the upper hair follicle.

This study demonstrates a varied distribution of keratins in the epidermis of the Malayan pangolin, suggesting evolutionary adaptations related to their distinctive scales.

This study identified the distribution of keratin-associated proteins during cornification in the epidermis of reptiles, revealing unique structural characteristics in sauropsid keratin proteins compared to other vertebrates.

This study found that the cytokeratin patterns in skin epithelia can distinguish between different types, with basal-cell epitheliomas showing a striking similarity to the pilosebaceous tract.

In this study, researchers reported that specific immunoreactivity patterns observed in hair follicle stem cell markers suggest different origins for trichilemmoma, basal cell carcinoma, and squamous cell carcinoma in human skin tissues.

This review discusses the unique characteristics and possible pathophysiology of spiny keratoderma, reporting no new clinical results, but suggests that some therapies might alleviate symptoms.

This study found that keratin 15 expressing cells from the hair follicle contribute to the development and long-term persistence of cutaneous papillomas in transgenic mice, with a subset showing the Ha-ras mutation.