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

Cells communicate with neighbors to coordinate their development.

New therapies show promise for wound healing, but more research is needed for safe, affordable options.

Hair growth-related cells need the enzyme SCD1 to help maintain the area that supports hair growth.

Accurate diagnosis of cicatricial alopecias requires thorough scalp examination and multiple biopsy techniques.

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

Keratinization in embryos helped vertebrates adapt to land by forming a protective skin barrier.

Reptile skin hardens by layering beta-proteins on keratin.

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

A new type of amniotic tissue graft improves wound healing better than other grafts.

Pangolin scales evolved for protection, hardening with age, due to keratin gene diversification.

Cornification evolved from keratinization in vertebrates, with differences between mammals and sauropsids.

Only Deomyinae rodents can regenerate complex tissues.

Certain genes are more active during wound healing in axolotl and Acomys, which could help develop materials that improve human wound healing and regeneration.

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

Scaffoldin helps form hard skin structures in chicken embryos.

Deleting the Hoxc13 gene in frogs shows its crucial role in developing skin structures similar to hair.

Terrestrial vertebrates have balanced keratin gene clusters, unlike teleost fish.

Manatee whiskers are specially adapted for touch in water.

Bird foot scales develop differently and can repair but not fully regenerate due to the lack of specialized stem cell areas.

Extracellular vesicles from amniotic fluid stem cells can improve underdeveloped fetal lungs.

Spiny mice can regenerate tissues instead of forming scars.

Gray short-tailed opossums' skin shifts from helping with breathing to regulating body temperature as they grow.

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

Xenopus laevis tadpoles can regenerate complex tail structures, offering insights for regenerative medicine.

A mare had a functional ovary with a tumor containing cartilage and bone.

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

Mouse embryos can develop in chick embryos, but they grow smaller with some organ issues.