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

Lizard claws have hair-like keratins similar to those in mammals.

Pangolins have lost some skin-related genes, but kept others, leading to their unique scales and skin features.

Camel skin has typical mammalian layers, with hair follicles, glands, and muscles, varying by body area.

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

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

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

Vertebrate skin evolved to be more specialized and complex, especially in land animals.

The silver marmoset's skin is thin, lacks pigment cells, and has unique features like keratinized spines and specialized glands.

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.

Scaffoldin helps form hard skin structures in chicken embryos.

The study identifies the pheromone gland's location and structure in Endoclita vietnamensis, aiding future pest control methods.

Hairless mice have longer hair follicles and abnormal structures during the catagen phase.

The hair's outermost surface has multiple layers of lipids and proteins.

B-type hairs on female butterfly legs help them choose where to lay eggs.

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

CARB is a strong barrier in human hair that prevents dye penetration.

The hair cuticle is made of tough proteins that protect the hair, but more research is needed to fully understand its structure.

Reptile skin hardens by layering beta-proteins on keratin.

Two mouse mutants have defective hair cuticle cross-linking.

Hair proteins change location and structure as hair cells mature.

Inherited ichthyoses cause widespread skin scaling and thickening due to gene mutations.

The big-clawed shrew's sinus hair follicles are highly specialized for sensing vibrations.

A tough membrane between the outer and inner layers of human hair protects it from damage.

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

Basal-cell epitheliomas and the pilosebaceous tract share a unique keratin, distinguishing them from other skin areas.

Domestic cat hair varies in thickness and length, with guard hairs being longest and thickest, and all hair types mainly contain keratin.

Keratins K1 and K10 are found in the inner root sheath and cuticle of human hair follicles.