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Mammalian hair scales change from smooth to wavy due to friction.

This article explores how extrafollicular environments and stem cell configurations influence hair and feather regeneration but provides no new experimental results.

This study reports that dynamic interactions between stem cells and their niche, influenced by macro-environmental factors, regulate regenerative behavior in integument pattern formation.

This study demonstrated how cellular flows and tissue mechanics guide the topological transformations in avian skin, essential for feather follicle development from scales.

This study found that female Holdobaggy goslings have higher melanin content in their dorsal plumage than males, suggesting that initial plumage color can be used for sex identification.

This study found that the Msx2 gene may regulate goose feather follicle development by influencing cell viability and gene expression, with potential implications for improving down production.

This study reports that Wise is expressed in specific patterns during the morphogenesis of chick embryos, particularly in regions associated with known signaling molecules like Wnt, Bmp, and Shh.

This study investigated the gene and protein expression differences in early and late feathering chickens, identifying several pathways, like JAK-STAT and WNT, potentially involved in non-Mendelian feather growth regulation.

This study reported that mannan oligosaccharides improved the fur quality, immune response, antioxidant status, and gut microbiota of fur-growing raccoon dogs, suggesting they could potentially replace antibiotics in their diet.

In this study, researchers observed that in barn owls, the relationship between black feather spot size and testosterone levels varied by age and sex, suggesting involvement of genes regulating both traits rather than direct influence of testosterone on feather coloration.

This review discusses the use of hairs and feathers as defensive tools through toxin incorporation in certain mammals and birds and reports no new experimental findings.

In this study, hemp seed-derived exosomes (E40) showed potential for counteracting DHT-induced inhibition of feather follicle development in chicken embryos by modulating critical signaling pathways, suggesting a therapeutic approach for alopecia.

This biographical abstract highlights George Rogers' pioneering contributions to the understanding of keratin molecular structure and keratinisation biochemistry, including the application of electron microscopy to hair ultrastructure and the discovery of enzymes and gene transcription processes relevant to keratin proteins.

Patients often experience long-lasting changes to their hair after stem cell transplants.

This study found that certain chemotherapeutic agents, such as cyclophosphamide, disrupt feather formation and induce hair loss in mice by inhibiting cell proliferation through sonic hedgehog gene downregulation.

This review discusses common hair loss conditions and explores how advancements in hair follicle biology might lead to more effective treatments but reports no new results.

This study found that newborn mouse skin organoids can robustly grow hair in vivo, while adult organoids require specific interventions to restore their hair-forming ability.

Experiments can shape how feathers grow and develop.

The study found that bioengineered hair follicles work when using cells from the same species but have issues when combining human and mouse cells.

This study developed a bioengineering method to reconstruct embryonic dorsal skin from dissociated chick skin cells, allowing feather buds to form and grow in vitro, influenced by epithelial-mesenchymal interactions.

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.

This study investigated the hair structure of wild pigs in the Balıkesir region using stereomicroscopy and scanning electron microscopy, finding distinct bifurcation patterns, but concluded that pig bristles used in brushes likely wouldn't retain these features, complicating species identification.

Metabolic disorders can cause hair structure defects and growth issues, but amino acid levels in hair remain normal.

In this study, autopsies of children who suffered fatal abuse revealed stress-associated markers like telogen effluvium and thymus involution, which may help pathologists identify chronic abuse cases.

This study suggests that the structure and function of mouse melanocytes in the epidermis and hair bulb are influenced by genetic factors and local tissue environment, including hormones and growth factors.

This study found that feather patterning is primarily self-organizing and dynamic, relying on both genetic and epigenetic controls, with implications for similar processes like fingerprints and pigmentation.

This study found that mesenchymal cell processes from the dermal papilla contact epithelial hair matrix cells through gaps in the basal lamina during hair matrix cell differentiation in mouse vibrissa follicles.

This review highlights the role of various signalling pathways, particularly the inhibitory BMP pathway, in regulating feather follicle development in poultry and discusses the application of biotechnology for enhancing poultry aesthetics, emphasizing the increasing importance of feather follicles in ice-fresh poultry sales in China.

In this study, researchers examined chicken feather follicle tissues from differently colored chickens and found that the genes SLC45A2 and GPNMB are involved in promoting melanin deposition, which enriches understanding of the genetic mechanisms affecting feather color.

In this study, researchers observed that fasting-induced molting in laying hens led to increased thyroid hormones, which may regulate feather molting by affecting hair follicle growth through specific signaling pathways, highlighting molecular changes during induced molting.