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Trichilemmal keratinization is a unique process in hair follicles where the outer root sheath turns into keratin without a specific layer.

The southern elephant seal's skin layer helps waterproof the skin by being tightly connected to hair shafts.

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

pCLCA2 protein may help maintain skin structure and function.

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

Marsupial hair structure and keratin distribution are similar to placental mammals.

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

Mouse tail skin has different keratinization near hair follicles and scales.

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

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

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

Clouston syndrome can lead to skin cancer, so monitoring is crucial.

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.

Pincer nails are rare in lupus patients and may be managed conservatively.

The girl's "dandruff" was actually harmless hair casts, not a hygiene issue.

Cystatin M/E helps in the final stages of hair and nail formation by controlling certain enzymes.

The outer root sheath in hair follicles changes during growth, with different keratinization processes in its layers.

The cuticle layer in hair follicles thickens during keratinization due to incomplete cytosol loss.

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

Keratins in Malayan pangolins vary by region, suggesting scales evolved from the tail towards the head.

The onychodermis helps anchor the nail bed and may aid in nail formation.

Hair fibers may have a unique, non-protein sheath not previously identified.

Reptile skin hardens by layering beta-proteins on keratin.

Sciellin is a protein that helps form protective layers in skin, hair, and nails.