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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.

Colchicine causes hair loss by damaging hair follicles.

Glycogen metabolism is important for energy and processes in human hair follicles, and hair follicles may produce glucose from lactate.

IL-15 helps maintain hair growth and protects the immune status of hair follicles.

A new topical treatment may prevent hair loss from cancer therapy by adjusting cell death processes in hair follicles.

Inaudible sound at 30 kHz can boost hair growth and decrease hair loss by promoting cell growth and reducing cell death in hair follicles.

Hair growth is cyclic and influenced mainly by local factors.

The document concludes that the hair cycle is a complex process involving growth, regression, and rest phases, regulated by various molecular signals.

Hair growth phase and certain genes can speed up wound healing, while an inflammatory mediator can slow down new hair growth after a wound. Understanding these factors can improve tissue regeneration during wound healing.

The skin's layers protect, sense, and regulate the body's internal balance, but can be prone to cancer.

The document concludes that the hair cycle is a complex process involving growth, regression, and rest phases, regulated by various molecular signals.

Children's hair grows in different types from before birth through puberty, with growth rates and characteristics varying by age, sex, and race.

Valproic acid may help hair grow and could be a safe treatment for hair loss.

Neonatal hair can help determine drug exposure during pregnancy.

Different hair growth problems are caused by genetic issues or changes in hair growth cycles, and new treatments are being developed.

Crataegus pinnatifida extract may help increase hair growth and thickness in mice.

The model showed that randomness accurately describes individual hair growth cycles and that synchronization can cause large fluctuations not seen in humans.

COVID-19 may cause hair loss and scalp pain due to inflammation and changes in hair follicle receptors, but these symptoms typically resolve in 2 to 4 months.

KB2115 (eprotirome) can safely extend the hair growth phase without damaging cells or changing hair color.

Home-use light devices can significantly reduce hair but are less effective on very dark skin and slower than professional devices.

Hair is important for protection, social interaction, and temperature control, and is made of a growth cycle-influenced follicle and a complex shaft.

Decorin, a protein, may help start hair growth and could be used to treat hair loss.

Hair growth is influenced by hormones and goes through different phases; androgens can both promote and inhibit hair growth depending on the body area.

Growth hormone is important for regulating human hair growth.

OCIAD2 and DCN genes affect hair growth in goats by having opposite effects on a growth signaling pathway and inhibiting each other.

The document concludes that hair biology is complex and there are still unanswered questions about hair loss and follicle changes.

The skin has multiple layers and cells, serves as a protective barrier, helps regulate temperature, enables sensation, affects appearance, and is involved in vitamin D synthesis.

Inhibiting Zyxin may help treat androgenetic alopecia by promoting hair growth.

Some medications can cause reversible hair loss by affecting hair growth cycles.

Dermal papilla microtissues could be useful for initial hair growth drug testing.