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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.

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

Reptile skin hardens by layering beta-proteins on keratin.

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

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

Mammalian hair scales change from smooth to wavy due to friction.

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

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

Activating the sonic hedgehog pathway in chicken embryos can permanently change scales to feathers.

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

The research identified two types of keratinocytes in chicken scales: one for hard scales and another for soft skin, with similarities to human skin differentiation.

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

Key genes can rewire networks, changing skin appendage types.

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

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

Rat vibrissae structure relates to their sensory function.

The ovine interdigital sinus has a complex structure with three layers and various skin-like features.

Ichthyoses are skin disorders causing scales, with treatment depending on type and severity.

Understanding proteins in skin structures like claws and hair is crucial for future research.

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

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

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

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

Mammary glands evolved from hair organs in Monodelphis domestica.

Harp seals have different innervation patterns in their whiskers, with lateral whiskers having more axons than medial ones.

Rat vibrissae have sensory terminals with specific structures that help detect hair movements.

Brandt's hedgehog has thick skin on its back and many glands near its nostrils.

The side gland of Suncus murinus is a good model for studying human sebaceous glands.