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This review examines the role of stem cells and their niches in continuously growing ectodermal organs like teeth, hair, and claws, providing insights from mouse models without presenting new research findings.

This article reviews the role of epithelial-mesenchymal interactions in hair follicle development and discusses the challenges of understanding the signals that regulate this complex process; it reports no new results.

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

This study found that T cytokeratins appear more gradually and with complex coexpression patterns in developing nail structures compared to the more abrupt transition in hair follicles.

This study found that retinoic acid induces epidermal transdifferentiation into mucosal epithelium in both chick and mammalian embryonic skin, involving specific gene expressions and pathways.

This study demonstrates that keratinocyte cell lines derived from cultured hair follicles can fully differentiate in organotypic skin models, offering a minimally invasive alternative to obtaining keratinocytes for research.

This study found that adding keratin to a collagen hydrogel improved keratinocyte differentiation compared to a pure collagen hydrogel, particularly when calcium was also present in the media.

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

This study found that keratin 7 protein expression increased in colon cancer epithelial-derived cells when treated with neutrophil and macrophage conditioned media, suggesting immune cell-derived factors may influence keratin expression.

This review discusses recent advancements in the study and application of epidermal stem cells for wound healing and tissue engineering, without presenting new experimental findings.

This review discusses how engineering cell surfaces with polyelectrolytes can address challenges in cell therapy and related biomedical fields and reports no new research findings.

This study observed that the mechanical connection between hair follicles and connective tissue in human fetal scalp skin is weaker than in the corresponding skin components, reflecting dynamic processes in hair growth.

This study utilized a pigmented human epidermal equivalent model to incorporate melanocytes into the epidermis and found enhanced differentiation potential compared to conventional in vitro systems, reflecting in vivo cellular trajectories and highlighting melanocyte-to-keratinocyte communication pathways.

Merkel cells are abundant in facial vellus hair follicles, especially during the anagen phase.

This study developed a culture method to expand and differentiate primary mammary basal cells, identifying key transcription factors like EGR1 and ELF3 that influence Claudin expression and actin organization, offering insights into epithelial cell biology and potential applications in related research fields.

This study summarizes the signaling molecules and extracellular components involved in epithelial–mesenchymal interactions, enhancing our understanding of hair follicle regeneration and skin wound healing, but reports no new experimental results.

The researchers reported that components of keratinocytes influence the formation and differentiation of the stratum corneum, the epidermis's most specialized layer.

This study demonstrates that incorporating human neopapilla into reconstructed human skin can initiate hair follicle morphogenesis by stimulating epidermal invagination and maintaining follicle-inductive properties in vitro.

The study examined cytokeratin expression in different bovine epithelial tissues, finding that hair follicles and nasolabial glands express both acidic and basic types, while other epithelia express only one type.

The researchers reported that scaffoldin, a protein identified in chicken embryos, likely plays a role in forming periderm granules and contributes to the soft cornification of embryonic epidermis.

This study found that the transcription factor Gata6 regulates the sebaceous duct lineage identity and plays a crucial role in epidermal wound healing by enabling dedifferentiation and broader lineage capabilities in post-mitotic cells.

This study reported that immortalizing human dermal papilla cells using HPV16 E6/E7 oncogenes increased their proliferation and maintained their hair follicle formation capability, potentially facilitating in vitro hair growth and regeneration research.

This study introduced a theoretical model suggesting that the morphological transition from bud to cap in tooth germ development is driven by mechanical interactions among cells.

This article, a special issue on hair follicle biology and pathology, reports no new research findings.

This study demonstrated that the human thymus contains clonogenic thymic epithelial cells capable of self-renewal and maintaining a thymic phenotype in a specific culture system.

This study observed that 67 kDa keratin was expressed homogeneously only in epidermis derived from hair follicle explants, differing from other culture methods where expression was delayed and patchy.

This paper reviews recent findings on epidermal development and stem cell regulation, listing key studies that contribute to understanding the molecular pathways involved in skin morphogenesis without reporting new experimental results.

This study demonstrated the potential of newly fabricated epithelial cell scaffolds to enhance hair regeneration, showing promise for future alopecia treatments.

This paper reviews signaling influences and niches of epidermal stem cells and compares various types, but does not present new experimental findings.

This narrative review discusses the structure and functions of the skin, focusing on its barrier role, self-repair, thermoregulation, and immune functions, and reports no new experimental results.