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This study found that the HoxC gene cluster plays a critical role in the development of ectodermal organs, including hair and nails, with mammalian-specific enhancers increasing transcription levels during development.

This review discusses the evolutionary history of keratins and reports no new results, highlighting key events that contributed to the development of mammalian hair and integument.

In this study, researchers propose that different vertebrate skin appendages, such as hair, feathers, and scales, evolved in parallel from a shared ancestral cell structure associated with teeth, dating back approximately 420 million years ago.

This article proposes a hypothesis that KRT75, a protein found in hair follicles, was evolutionarily co-opted by ameloblasts during the development of prismatic enamel in synapsids, but reports no new results.

This study reports that KRTAP-like proteins, which resemble keratin-associated proteins found in mammals, are also present in the cornified teeth of various lamprey species, suggesting these proteins may serve similar functions in skin appendages across different vertebrates despite independent evolutionary origins.

This research suggests that hair keratins evolved from claw keratins in a hairless ancestor, with Hoxc13 controlling their expression in tetrapods, evidenced by the knockout of Hoxc13 hindering claw formation in Xenopus tropicalis frogs.

This study described the diverse vibrissal follicle anatomy in fetuses of three cetacean species and observed species-specific differences, supporting further investigation into vibrissal form and function across cetaceans.

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

This review highlights the regenerative abilities of *Xenopus laevis*, focusing on how tadpoles regrow complex tail structures and the cellular and molecular mechanisms behind this. It underscores *X. laevis* as a valuable model for understanding regeneration, with insights potentially advancing regenerative medicine.

This review explores how spiny mice (Acomys spp.) exhibit unique regenerative healing abilities, with findings indicating that these rodents use specialized injury response mechanisms and proregenerative pathways to enhance tissue repair and regeneration compared to scar-forming mammals.

This case report describes the presence of a teratoma within an equine antral follicle and suggests that the ovary maintained functionality despite the teratoma, as indicated by active antral follicles and recent ovulation.

This study found that incorporating cell-adhesive ligands into 3D peptide hydrogels supports the survival and osteogenic differentiation of human amniotic mesenchymal stem cells.

This study found that mouse embryoid bodies adhered quickly and differentiated efficiently into cardiomyocytes on negatively charged poly(sodium p-styrene sulfonate) hydrogels, similar to their behavior on gelatin-coated polystyrene.

In this study, researchers found that the cornification process in the nuptial pads of Xenopus frogs involves the expression of the type II hair keratin homolog, krt59, and is regulated by the transcription factor hoxc13, showing similarities to mammalian hair evolution.

This review reports that the human amniotic membrane has promising regenerative, anti-inflammatory, and antimicrobial properties, suggesting its potential for innovative clinical applications in dermatology, such as wound healing and psoriasis treatment, as well as aesthetic uses like skin rejuvenation and hair regeneration.

This review synthesizes current knowledge on choriogenesis, the final stage of oogenesis in insects, by exploring the role of follicle cells, regulatory mechanisms of gene expression, and the biochemical makeup of the eggshell, while also highlighting structural diversity and adaptations across insect species.

This study found that exosome-incorporated human amniotic membrane scaffolds notably enhanced diabetic skin wound healing in mice, suggesting potential applications for ADSC-derived exosomes in clinical settings.

In this study, freezing gamma-irradiated amniotic fluid increased hair follicles and accelerated the transition to the anagen stage in rats, suggesting potential for treating hair loss safely and effectively.

In this study, a hydrogel derived from Andrias davidianus secretion, combined with micronized amnion, promoted skin regeneration and achieved scarless healing in rats, suggesting potential for clinical use.

This study suggests that short-term treatments with specific small molecules may enhance the differentiation potential and stem cell properties of human amniotic fluid stem cells.

This study developed a new analytical method to identify a wide range of endocrine disrupting compounds in full-term amniotic fluid, revealing diverse substances with potential endocrine activity.

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 review provides an overview of Hox genes, focusing on their evolutionary history, genomic organization, and roles in development, but reports no new study results.

This study found that the differential expression of α- and β-keratin genes in feathers may explain their morphological and structural diversity, highlighting the chicken as a model for studying keratin-related diseases.

This study identified a new S100 fused-type protein, scaffoldin, in reptiles and birds and suggests that SFTP-positive epithelia serve as scaffolds for the growth of various skin appendages, indicating a common evolutionary origin.

This research found that variations in the KRTAP gene family are likely responsible for the diverse hair phenotypes seen among mammals, influenced by gene repertoire differences, expression, and evolutionary factors.

This study found that combining adult germinative epidermal cells with non-inductive dermal cells can stimulate hair follicle neogenesis, effectively altering the cells' status to enhance induction.

This article introduces the concept of organ size control in regeneration, regulated by the Hippo signaling pathway, but reports no new experimental results.

In this study, forced expression of the transcription factor cDermo-1 in chicken dermis led to the formation of ectopic feather buds and enhanced feather growth, demonstrating its role in initiating skin appendage development.

This review outlines the evolution of hair follicle engineering and its foundational discoveries, but reports no new experimental results.