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HtrA2 activity is crucial for normal hair growth by regulating fat cell development.

Overexpressing ovine β-catenin in mice skin increases hair follicle density and growth.

The paper suggests that telogen effluvium, a type of hair loss, may be a long-lasting condition triggered by stress or illness in people whose hair growth is unusually synchronized.

The vitamin D receptor helps regulate skin and hair health independently of its usual vitamin D ligand.

Hair follicle stem cells can return to their original niche and help regenerate hair.

The document concludes that both internal stem cell factors and external influences like the environment and hormones affect hair loss and aging, with potential treatments focusing on these areas.

Hormones, nutrition, and seasonal changes regulate hair growth cycles, with androgens extending growth phases and factors like aging and malnutrition affecting hair loss and thinning.

Zinc, copper, and iron are important for skin health and may help diagnose skin diseases.

Minoxidil stimulates hair growth by increasing hair thickness and prolonging growth phase.

The document provides a method to classify human hair growth stages using a model with human scalp on mice, aiming to standardize hair research.