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Hair follicles are complex, dynamic mini-organs that help us understand cell growth, death, migration, and differentiation, as well as tissue regeneration and tumor biology.

Wnt and Notch signaling help wound healing by promoting cell growth and regulating cell differentiation.

UVB radiation harms hair growth and health, causing cell death and other changes in human hair follicles.

Androgens affect bone and fat cell development differently based on the cells' embryonic origin.

Blackcurrant extract may help reduce hair loss by promoting stem cell activity in hair follicles.

Humans have limited regenerative abilities, but new evidence shows the adult brain and heart can regenerate, and future treatments may improve this by mimicking stem cell environments.

IL-9 increases skin cell movement but decreases their ability to invade, and this effect is controlled by cell contractility, not by MMPs.

Improving the environment and cell interactions is key for creating human hair in the lab.

Keratins are important for skin cell health and their problems can cause diseases.

Vitamin D and its receptor regulate skin functions like cell growth, immunity, hair cycle, and tumor prevention.

Understanding the scalp's five-layer structure is crucial for better surgical outcomes and fewer complications.

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

Dermabrasion improves skin appearance by removing the top layer to promote healing.

ALA-photodynamic therapy helps reduce acne by causing acne cell death and lowering certain skin protein levels.

Muse cells keep their special features and can become different cell types even after being frozen and thawed three times.

People with certain allergic conditions or higher white blood cell counts have more severe hair loss, and treating hair and nail side effects early in melanoma therapy can improve quality of life.

The document explains hair and nail biology, common hair loss conditions and treatments, oral and genital skin diseases, and the risks and treatments associated with squamous cell carcinoma.

Finasteride treatment in male rats causes long-lasting effects on depression-like behavior, brain cell growth, inflammation, and gut bacteria composition.

TGF-alpha is present in sheep and ferret skin and may affect hair growth without directly stimulating cell proliferation.

The document concludes that while some organisms can regenerate body parts, mammals generally cannot, and cancer progression is complex, involving mutations rather than a strict stem cell hierarchy.

The review concludes that accurate diagnosis of different types of hair loss requires proper biopsy techniques and understanding the hair growth cycle and underlying causes.

Overexpression of activin A in mice skin causes skin thickening, fibrosis, and improved wound healing.

Two specific hair keratin genes are active during hair growth and decline as hair transitions to rest.

Hair follicles are essential for skin health, aiding in hair growth, wound healing, and immune function.

Lack of Ctip2 in skin cells delays wound healing and disrupts hair follicle stem cell markers in mice.

Topical treatments can deliver active molecules to skin stem cells, potentially helping treat skin and hair disorders, including skin cancers and hair loss.

Patients with androgenetic alopecia have thinner subcutaneous fat layers in their frontal scalp compared to healthy individuals.

Different types of skin stem cells can change and adapt, which is important for developing new treatments.

Human alpha defensin 5 helps heal wounds, reduce bacteria, and grow hair on burned skin.

The hair follicle infundibulum plays a key role in skin health and disease, and understanding it better could lead to new skin disease treatments.