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Androgens can both stimulate and cause hair loss, and understanding their effects is key to treating hair disorders.

All-trans retinoic acid causes hair loss by increasing TGF-β2 in hair follicle cells.

Hair grays due to oxidative stress and fewer functioning melanocytes.

Treatment with plasma rich in growth factors improved hair density and thickness for hair loss patients.

The document concludes that for hair and feather growth, it's better to target the environment around stem cells than the cells themselves.

Hedgehog signaling helps keep hair follicle stem cells the same in both young and old human skin.

Melatonin implants and long daylight hours alter the timing of hormone release and hair growth in mouflon sheep.

The study found that bioengineered hair follicles work when using cells from the same species but have issues when combining human and mouse cells.

Claudin-1 is important for the barrier function and growth of hair.

Aging in hair follicle stem cells leads to hair graying, thinning, and loss.

Human hair keratin helps repair nerve damage in rats.

Skin and hair can help us understand organ regeneration, especially how certain stem cells might be used to form new organs.

Finasteride improves surrounding scalp hair and increases hair density after hair transplant.

South American camelids should be sheared early, fleece type affects fiber quality, and the S/P follicle ratio doesn't distinguish between Bolivian llama genotypes.

Dermal papillae cells, important for hair growth, come from multiple cell lines and can be formed by skin cells, regardless of their origin or hair cycle phase. These cells rarely divide, but their ability to shape tissue may contribute to their efficiency in inducing hair growth.

Finasteride improves surrounding scalp hair and increases hair density after hair transplant.

Hair dyes can change hair color temporarily or permanently but may cause side effects like skin reactions and hair damage.

Aging scalp skin contributes to hair aging and loss, and more research is needed to develop better hair loss treatments.

The hair follicle bulge is an important area for adult stem cells involved in hair growth and repair, with potential for medical use needing more research.

Animal models are crucial for learning about hair loss and finding treatments.

The hair serum significantly improved hair growth and reduced hair fall without causing any skin issues.

Friesian heifers take about 18 months to adapt to Kenya's climate, with hair changes not strongly linked to weight gain.

Bacteria in our hair can affect its health and growth, and studying these bacteria could help us understand hair diseases better.

Liaoning Cashmere goat hair follicles show synchronized growth patterns with lowest activity in May.

Hair loss surgeries like grafts, scalp reductions, and flap rotations can be effective for black men with proper technique adjustments.

α-parvin is necessary for skin and hair growth and for the correct orientation of skin cells.

Mice with too much sPLA₂-IIA have hair loss and poor wound healing due to abnormal hair growth and stem cell depletion.

Air pollution can cause hair loss, and using antioxidants, special shampoos, and coconut oil can improve scalp health and hair density.

Polycomb Repressive Complex 2 is not needed for hair regeneration.

The document explains how to create detailed biological pathways using genomic data and tools, with examples of hair and breast development.