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Early and late matrix progenitors in hair follicles create different cell layers, with early ones forming the companion layer and later ones forming the inner root sheath and hair shaft.

Replenishing free 18-MEA can help restore damaged hair surfaces.

Keratin from hair binds well to gold and BMP-2, useful for bone repair.

Keratin helps skin cells mature when added to a collagen mix, which could be important for skin and hair health.

Water and fatty acids affect hair's surface differently based on hair damage, and models can help understand hair-cosmetic interactions.

There are two types of stem cells in rodent hair follicles, each with different keratin proteins.

MAP-2 is crucial for the structure of hair follicles and nails.

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

Beautiful hair is flexible and elastic due to its unique double-layered structure and can be enhanced with succinic acid treatment.

Pubic hair has a thicker, more protective outer layer than scalp hair, possibly due to evolution.

The human skin's outer layer has more variety in cell types and development paths than previously thought.

Hair growth can be influenced by manipulating keratin and growth factor genes.

Frog skin cells need the protein desmoplakin for proper development and cell layer formation.

Vitamin D receptor is crucial for starting hair growth after birth.

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.

Older thin hair is not just thinner but also has different shape, structure, and stiffness.

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

Sweat glands and hair follicles are determined by opposing signals, with BMPs promoting sweat glands and blocking BMPs leading to hair follicles.

A one-year-old cat had multiple benign skin tumors similar to those known in humans.

Hair fiber research combines multiple sciences to improve hair care products.

The document concludes that understanding hair's composition and the effects of treatments can lead to better hair care products.

Trichothiodystrophy hair is structurally abnormal with protein and organization issues.

Human hair follicle stem cells show signs of low oxygen levels, which may be important for hair growth and preventing baldness.

The research found that postmortem root bands in hair are likely caused by the breakdown of a specific part of the hair's inner structure after death.

Lymphoid-specific helicase (Lsh) is crucial for skin growth, change, and healing after injury.

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

Hair analysis can detect drug use but is costly and interpretation is complex.

Guinea-pig hair and follicle proteins are mostly similar, but follicles have more group 2 proteins and fewer group 3 and 4 proteins.

Caspase-14 is important for skin and hair development in all mammals.

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