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Cat claws stay sharp by shedding their outer layer through microcracks formed during activities.

The conclusion is that teeth, hair, and claws have similar stem cell niches, which are important for growth and repair, and more research is needed on their regulation and potential markers.

Hair and nail cells share similar proteins, indicating a common differentiation pathway.

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

Mice without certain skin proteins had abnormal skin and hair development.

Modulating BMP activity changes the number, size, shape, and type of ectodermal organs.

Scaffoldin helps form hard skin structures in chicken embryos.

Transglutaminase activity is important for skin and is found in both mammals and birds.

Different ectodermal organs like hair and feathers regenerate differently, with specific stem cells and signals involved in their growth and response to the environment.

Follistatin helps hair growth and cycling, while activin prevents it.

SV40 T antigen in hair follicles causes abnormal hair and health issues in mice.

The document concludes that the human keratin gene cluster is complex, with a need for updated naming to reflect over 50 functional genes important for hair and skin biology.

New treatments targeting specific genes show promise for treating keratin disorders.

Skin problems can be caused or worsened by physical forces and pressure on the skin.

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

The conclusion is that skin and hair patterns are formed by a mix of cell activities, molecular signals, and environmental factors.

Keratin 33A is a key protein in goat winter coats, especially in high-producing breeds.

Angora goat hair grows faster and produces more protein than cashmere goat hair, and certain hormones and nutrients positively affect hair growth and protein synthesis.

Electrospun scaffolds can improve healing in diabetic wounds.

Hair can't be reliably repaired once damaged; prevention and proper product use are key to maintaining hair health.

The document explains how hair follicles develop, their structure, and how they grow.

George Ernest Rogers was a notable scientist who made important discoveries about hair and wool proteins.

COX2 and ATP synthase control the size of hedgehog spines.

Researchers found a genetic link for hereditary hair loss but need more analysis to identify the exact gene.

Different fish use the same genes to regrow teeth.

Cosmetic procedures can harm hair, but damage can be minimized with knowledge and care; however, once hair is damaged, it cannot be reliably repaired.

The document explains various skin conditions and their treatments.

Trichohyalin-like proteins are essential for the development of skin structures like hair, nails, and feathers.

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

Different species use the same genes for tooth regeneration.