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High levels of testosterone and dihydrotestosterone inhibit hair cell growth, while high levels of estradiol promote it.

Lizards can regrow their tail scales with the same structure, distribution, and gender-specific features as the original ones, and this unique ability is not seen in adult mammals.

A rare gene mutation causes skin fragility and itching without affecting hair or nails.

The document concludes that scalp health is influenced by complex factors affecting sebaceous glands, including hormones, aging, and various substances.

Red deer only have androgen receptors in neck hair cells for mane growth during breeding season.

K31 can identify clear secretory cells in human sweat glands.

Botulinum neurotoxin A is effective and safe for treating various conditions, but more clinical trials are needed to fully assess its benefits and risks.

Curcuma aeruginosa extract lotion significantly reduces underarm hair growth.

The testes produce sperm and hormones essential for male development.

Netherton's syndrome can cause frequent bacterial infections beyond just skin issues.