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Monotreme hair structure and protein distribution are similar to other mammals, but their inner root sheath cornifies differently, suggesting a unique evolution from reptile skin.

Hair in mammals likely evolved from glandular structures, not scales.

Reptile skin protects and prevents water loss, helping them adapt to land.

Hair follicle keratin may have been used in tooth enamel evolution.

Hard skin features like scales, feathers, and hair evolved through specific protein changes in different animal groups.

The inner root sheath evolved to help hair grow safely through the skin in mammals.

Different hair types in mammals are linked to variations in specific protein genes, with changes influenced by their living environments.

The skin systems of jawed vertebrates evolved diverse appendages like hair and scales from a common structure over 420 million years ago.

Reptile scales help us understand the evolution of skin features like hair and feathers.

Corneous beta-proteins evolved uniquely in reptiles and birds, forming scales, claws, beaks, and feathers.

Reptilian scales, feathers, and hairs evolved from changes in skin cell interactions.

Reptile skin hardens by layering beta-proteins on keratin.

Bird scales evolved from feathers, not reptile scales.

Snakes and worm lizards lost claw proteins due to similar evolutionary changes.

Cysteine-rich keratins evolved independently in mammals, reptiles, and birds for hard skin structures like hair, claws, and feathers.

Lizards can regrow their tail scales with the same structure, distribution, and gender-specific features as the original ones, and this unique ability is not seen in adult mammals.

Reptiles have genes similar to hair proteins, suggesting hair's genetic origins predate mammals.

Jawless vertebrates have teeth proteins similar to those in mammalian hair and nails.

Early tetrapod keratins evolved into toe pad proteins in amphibians and hair proteins in mammals.

Blocking a specific protein signal can make hair grow on mouse nipples.

Human sweat glands contain stem cells capable of self-renewal and forming different cell types.

Histone demethylases can change gene expression and may be linked to diseases like cancer.

ATP-dependent chromatin-remodeling complexes are crucial for gene regulation, cell differentiation, and organ development in mammals.

Lower levels of certain brain chemicals are linked to worse PTSD symptoms in men.

Valproic acid increases hair count in men with hair loss.

Fibroblasts, cells usually linked to tissue repair, also help regenerate various organs and their ability decreases with age. Turning adult fibroblasts back to a younger state could be a new treatment approach.

Proper control of β-catenin activity is crucial for development and preventing diseases like cancer.

Finasteride given to baby rats causes anxiety-like behavior and worsens learning from punishment in adult rats.

Valproic acid helps delay hair loss and increases survival time for high-grade glioma patients undergoing radiation therapy.

Skin-derived stem cells can become various cell types, including germ cell-like and oocyte-like cells.