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This study identified two evolutionarily conserved ultra-high-sulfur keratin proteins in human and sheep hair follicles, which are specifically expressed in the hair cuticle during the late stages of fiber development.

This study reported the first known occurrence of citrulline in an animal protein, specifically in the fibrous protein of hair follicle inner root sheaths.

This study characterized proteins in hair-follicle and hair tissue, identifying similar protein types but with notable quantitative differences, which may reveal aspects of keratin protein synthesis.

Gene expression in wool follicles changes with growth cycles, offering insights into wool and human hair growth.

This study suggests that S100A4 and S100A6 proteins may play key roles in activating stem cells for hair follicle regeneration in mice.

This study investigated the formation of a specific chemical crosslink in hair proteins and explored the role of transamidase enzymes in hair follicles.

This study found that a cocktail of three proteins from embryonic skin can enable adult fibroblasts to regenerate hair follicles by altering gene expression and activating regenerative signaling pathways.

This study observed that epidermal-specific deletion of aPKCλ in mice disrupts hair follicle stem cell quiescence, leading to altered hair follicle cycling and skin anomalies.

This study identified the expression sites of five KAP5 genes on human chromosome 11q13.5 in scalp skin sections but did not explore their detailed distribution within hair follicles.

In this study, researchers reported that wound dressings made from bacterial cellulose composites modified with soybean protein (BC/7S and BC/11S) improved wound healing and reduced scarring in rat models, with BC/11S showing superior outcomes.

In laboratory settings, this study suggests that Serenoa repens and N-acetyl glucosamine with milk proteins may promote hair follicle vascularization through specific cellular interactions and actions.

This study identified key proteins, such as Sfrp1 and Ppard, involved in the complex and dynamic regulation of yak hair follicle growth and degeneration across different stages, offering insights into yaks' adaptation to highland environments.

This study suggests that some keratin-associated proteins with antecedents found in non-haired animals may have roles beyond hair characteristics, possibly contributing to the evolution of hair follicles.

This study found that combining mesenchymal stromal cells from adipose tissue and hair follicles with soy protein and β-chitin scaffolds significantly reduced wound healing time and improved skin regeneration in vivo.

In this study, researchers linked SARS-CoV-2 infection to telogen effluvium in some COVID-19 patients by observing the accumulation of viral proteins in hair follicle cells, which may trigger stress responses and cell death, suggesting hair follicles as a potential target in COVID-19.

In this study, a silk fibroin hydrogel containing recombinant NT3 was found to promote scar-less wound healing in a mouse skin injury model by enhancing type III collagen expression and inducing hair follicle formation.

In a keratinocyte-specific knockout mouse model, this study found that deleting GRK2 disrupted hair follicle homeostasis, causing cyst-like structures, abnormal growth patterns, and eventual hair loss, suggesting potential links to immune-mediated alopecias.

This study suggests that hemoglobin α expression in the epidermis is induced by oxidative stress and may function as an antioxidant, contributing to skin barrier function.

This study found that keratin-associated proteins related to metallothionein and occludin appear in various animals, suggesting they may have roles beyond hair characteristics and were later adapted for hair production.

This study found that protein extracts from embryonic skin can induce hair follicle neogenesis in mice by activating insulin/IGF signaling in adult fibroblasts.

This study reported that HSP27 protein shows varied expression in human scalp hair follicles across anagen, catagen, and telogen stages, suggesting a role in hair follicle biology.

This study found that bisindolylmaleimide PKC inhibitors increased DNA synthesis in mouse hair follicles, suggesting that PKC may inhibit hair follicle proliferation.

This study found that intermediate filaments and matrix proteins in presumptive hair shaft cells are synthesized sequentially, identifying a new polypeptide component that changes during hair cell differentiation.

This study observed structural and molecular changes in Ganxi goat skin that adapt to hot and humid climates and suggested that GSDMA might play a role in hair follicle regulation and skin homeostasis, though further research is needed to confirm its function in environmental adaptation.

This study reported that in degenerative alopecia, Zn²⁺/Cu²⁺-dependent proteases are downregulated and destabilized, and a specially developed microneedle patch reactivated these enzymes, reduced senescence, and enhanced hair regeneration in an animal model.

This study found that adding methionine to a low-protein diet improved wool production and feed efficiency in Angora rabbits by promoting hair follicle development through mechanisms involving IGF1, KAP, and versican signaling.

This review summarizes the roles of bone morphogenetic proteins in the development and regulation of normal and diseased skin, but it does not provide new clinical results.

This study found that transgenic mice overexpressing the BMP antagonist noggin showed increased hair follicle size and altered hair type, linked to changes in cell proliferation and gene expression.

This study found that overexpressing the BMP inhibitor Noggin in transgenic mice led to a significant loss of nontylotrich hair follicles, suggesting a critical role for BMP signaling in hair follicle morphogenesis and cycling.

This study suggests that the MAEG protein may facilitate epithelial–mesenchymal interactions during hair follicle development by binding to RGD-binding integrins like α8β1.