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The conclusion is that hair growth can be improved by activating hair cycles, changing the surrounding environment, healing wounds to create new hair follicles, and using stem cell technology.

Human hair follicle stem cells can turn into multiple cell types but lose some of this ability after being grown in the lab for a long time.

Prolactin affects when mice shed and grow hair.

Human hair follicles can regenerate after removal, but with low success rate.

The p53 protein helps control hair follicle shrinking by promoting cell death in mice.

PRP and HF-MSCs treatment improves hair growth, thickness, and density in androgenetic alopecia.

Dermal papilla cells help wounds heal better and can potentially grow new hair.

Prostaglandin D2 blocks new hair growth after skin injury through the Gpr44 receptor.

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

Human hair follicle cells can grow hair when put into mouse skin if they stay in contact with mouse cells.

Hair follicle stem cells are a promising source for tissue repair and treating skin or hair diseases.

The gene Foxq1, controlled by Hoxc13, is crucial for hair follicle differentiation.

Blocking BMP signaling causes hair loss and disrupts hair growth cycles.

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

Light can turn on hair growth cells through a nerve path starting in the eyes.

Wnt1a-conditioned medium from stem cells helps activate cells important for hair growth and can promote hair regrowth.

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

Two-photon microscopy helps observe hair follicle stem cell behaviors in mice.

Brain hormones significantly affect hair color and could potentially be used to prevent or reverse grey hair.

Disruptions in hair follicle fibroblast dynamics can cause hair growth problems.

Medium lipophilic substances penetrate skin best, and adding ethanol can increase delivery to hair follicles.

Mice without Vitamin D receptors have hair growth problems because of issues in the hedgehog signaling pathway.

miR-22, a type of microRNA, controls hair growth and its overproduction can cause hair loss, while its absence can speed up hair growth.

Brg1 is crucial for hair growth and skin repair by maintaining stem cells and promoting regeneration.

The document concludes that mouse models are crucial for studying hair biology and that all mutant mice may have hair growth abnormalities that require detailed analysis to identify.

Glutamine metabolism affects hair stem cell maintenance and their ability to change back to stem cells.

Human skin cells can create new hair follicles when transplanted into mice.

Maintaining the right amount of retinoic acid is crucial for healthy hair and skin.

Estrogens generally inhibit hair growth and improve skin quality, but their exact effects on hair follicles are complex and not fully understood.

The control system for hair growth cycles is not well understood and needs more research.